diff --git a/frontend/apps/reader/modules/readerdictionary.lua b/frontend/apps/reader/modules/readerdictionary.lua
index ecabd4eee..6f5119283 100644
--- a/frontend/apps/reader/modules/readerdictionary.lua
+++ b/frontend/apps/reader/modules/readerdictionary.lua
@@ -12,6 +12,7 @@ local ReaderDictionary = EventListener:new{}
 function ReaderDictionary:onLookupWord(word, box, highlight)
     self.highlight = highlight
     self:stardictLookup(word, box)
+    return true
 end
 
 function ReaderDictionary:stardictLookup(word, box)
@@ -47,24 +48,7 @@ end
 
 function ReaderDictionary:showDict(results, box)
     if results and results[1] then
-        DEBUG("showing quick lookup dictionary window")
-        local align = "center"
-        local region = Geom:new{
-            x = 0, y = 0,
-            w = Screen:getWidth(),
-            h = Screen:getHeight(),
-        }
-        if box then
-            if box.y + box.h/2 < Screen:getHeight()/2 then
-                region.y = box.y + box.h
-                region.h = Screen:getHeight() - box.y - box.h
-                align = "top"
-            else
-                region.y = 0
-                region.h = box.y
-                align = "bottom"
-            end
-        end
+        DEBUG("showing quick lookup window")
         UIManager:show(DictQuickLookup:new{
             ui = self.ui,
             highlight = self.highlight,
@@ -72,9 +56,9 @@ function ReaderDictionary:showDict(results, box)
             results = results,
             dictionary = self.default_dictionary,
             width = Screen:getWidth() - Screen:scaleByDPI(80),
-            height = math.min(region.h*0.7, Screen:getHeight()*0.5),
-            region = region,
-            align = align,
+            word_box = box,
+            -- differentiate between dict and wiki
+            wiki = self.wiki,
         })
     end
 end
@@ -82,6 +66,7 @@ end
 function ReaderDictionary:onUpdateDefaultDict(dict)
     DEBUG("make default dictionary:", dict)
     self.default_dictionary = dict
+    return true
 end
 
 function ReaderDictionary:onReadSettings(config)
diff --git a/frontend/apps/reader/modules/readerhighlight.lua b/frontend/apps/reader/modules/readerhighlight.lua
index 494abd8e9..c6d869e9f 100644
--- a/frontend/apps/reader/modules/readerhighlight.lua
+++ b/frontend/apps/reader/modules/readerhighlight.lua
@@ -294,8 +294,7 @@ function ReaderHighlight:onHoldRelease()
                         text = _("Highlight"),
                         callback = function()
                             self:saveHighlight()
-                            UIManager:close(self.highlight_dialog)
-                            self:handleEvent(Event:new("Tap"))
+                            self:onClose()
                         end,
                     },
                     {
@@ -303,39 +302,44 @@ function ReaderHighlight:onHoldRelease()
                         enabled = false,
                         callback = function()
                             self:addNote()
-                            UIManager:close(self.highlight_dialog)
-                            self:handleEvent(Event:new("Tap"))
+                            self:onClose()
                         end,
                     },
                 },
                 {
+                    {
+                        text = _("Wikipedia"),
+                        callback = function()
+                            UIManager:scheduleIn(0.1, function()
+                                self:lookupWikipedia()
+                                self:onClose()
+                            end)
+                        end,
+                    },
                     {
                         text = _("Translate"),
                         enabled = false,
                         callback = function()
                             self:translate(self.selected_text)
-                            UIManager:close(self.highlight_dialog)
-                            self:handleEvent(Event:new("Tap"))
-                        end,
-                    },
-                    {
-                        text = _("Share"),
-                        enabled = false,
-                        callback = function()
-                            self:shareHighlight()
-                            UIManager:close(self.highlight_dialog)
-                            self:handleEvent(Event:new("Tap"))
+                            self:onClose()
                         end,
                     },
                 },
                 {
+                    {
+                        text = _("Share"),
+                        enabled = false,
+                        callback = function()
+                            self:shareHighlight()
+                            self:onClose()
+                        end,
+                    },
                     {
                         text = _("More"),
                         enabled = false,
                         callback = function()
                             self:moreAction()
-                            UIManager:close(self.highlight_dialog)
-                            self:handleEvent(Event:new("Tap"))
+                            self:onClose()
                         end,
                     },
                 },
@@ -411,6 +415,12 @@ function ReaderHighlight:addNote()
     DEBUG("add Note")
 end
 
+function ReaderHighlight:lookupWikipedia()
+    if self.selected_text then
+        self.ui:handleEvent(Event:new("LookupWikipedia", self.selected_text.text))
+    end
+end
+
 function ReaderHighlight:shareHighlight()
     DEBUG("share highlight")
 end
@@ -436,4 +446,10 @@ function ReaderHighlight:onSaveSettings()
     self.ui.doc_settings:saveSetting("highlight_drawer", self.view.highlight.saved_drawer)
 end
 
+function ReaderHighlight:onClose()
+    UIManager:close(self.highlight_dialog)
+    -- clear highlighted text
+    self:handleEvent(Event:new("Tap"))
+end
+
 return ReaderHighlight
diff --git a/frontend/apps/reader/modules/readerwikipedia.lua b/frontend/apps/reader/modules/readerwikipedia.lua
new file mode 100644
index 000000000..17821e181
--- /dev/null
+++ b/frontend/apps/reader/modules/readerwikipedia.lua
@@ -0,0 +1,51 @@
+local ReaderDictionary = require("apps/reader/modules/readerdictionary")
+local EventListener = require("ui/widget/eventlistener")
+local Translator = require("ui/translator")
+local Wikipedia = require("ui/wikipedia")
+local UIManager = require("ui/uimanager")
+local Geom = require("ui/geometry")
+local Screen = require("ui/screen")
+local JSON = require("JSON")
+local DEBUG = require("dbg")
+local _ = require("gettext")
+
+-- Wikipedia as a special dictionary
+local ReaderWikipedia = ReaderDictionary:new{
+    -- identify itself
+    wiki = true,
+    no_page = _("No wiki page found."),
+}
+
+function ReaderWikipedia:onLookupWikipedia(word, box)
+    local lang = Translator:detect(word) or "en"
+    -- convert "zh-CN" and "zh-TW" to "zh"
+    lang = lang:match("(.*)-") or lang
+    local results = {}
+    local ok, pages = pcall(Wikipedia.wikintro, Wikipedia, word, lang)
+    if ok and pages then
+        for pageid, page in pairs(pages) do
+            local result = {
+                dict = _("Wikipedia"),
+                word = page.title,
+                definition = page.extract or self.no_page,
+            }
+            table.insert(results, result)
+        end
+        DEBUG("lookup result:", word, results)
+        self:showDict(results, box)
+    else
+        DEBUG("error:", pages)
+        -- dummy results
+        results = {
+            {
+                dict = _("Wikipedia"),
+                word = word,
+                definition = self.no_page,
+            }
+        }
+        DEBUG("dummy result table:", word, results)
+        self:showDict(results, box)
+    end
+end
+
+return ReaderWikipedia
diff --git a/frontend/apps/reader/readerui.lua b/frontend/apps/reader/readerui.lua
index 9bc50c61e..352da8887 100644
--- a/frontend/apps/reader/readerui.lua
+++ b/frontend/apps/reader/readerui.lua
@@ -29,6 +29,7 @@ local ReaderHighlight = require("apps/reader/modules/readerhighlight")
 local ReaderScreenshot = require("apps/reader/modules/readerscreenshot")
 local ReaderFrontLight = require("apps/reader/modules/readerfrontlight")
 local ReaderDictionary = require("apps/reader/modules/readerdictionary")
+local ReaderWikipedia = require("apps/reader/modules/readerwikipedia")
 local ReaderHyphenation = require("apps/reader/modules/readerhyphenation")
 local ReaderActivityIndicator = require("apps/reader/modules/readeractivityindicator")
 local ReaderLink = require("apps/reader/modules/readerlink")
@@ -142,6 +143,13 @@ function ReaderUI:init()
         ui = self,
         document = self.document,
     })
+    -- wikipedia
+    table.insert(self, ReaderWikipedia:new{
+        dialog = self.dialog,
+        view = self[1],
+        ui = self,
+        document = self.document,
+    })
     -- screenshot controller
     table.insert(self.active_widgets, ReaderScreenshot:new{
         dialog = self.dialog,
diff --git a/frontend/ui/translator.lua b/frontend/ui/translator.lua
new file mode 100644
index 000000000..357d8c83b
--- /dev/null
+++ b/frontend/ui/translator.lua
@@ -0,0 +1,85 @@
+local socket = require('socket')
+local url = require('socket.url')
+local http = require('socket.http')
+local https = require('ssl.https')
+local ltn12 = require('ltn12')
+local JSON = require("JSON")
+local DEBUG = require("dbg")
+
+--[[
+-- Translate text using Google Translate.
+-- http://translate.google.com/translate_a/t?client=z&ie=UTF-8&oe=UTF-8&hl=en&tl=en&text=hello
+--]]
+
+local Translator = {
+   trans_servers = {
+       "http://translate.google.cn",
+       "http://translate.google.com",
+   },
+   trans_path = "/translate_a/t",
+   trans_params = {
+       client = "z",  -- client z returns normal JSON result
+       ie = "UTF-8",
+       oe = "UTF-8",
+       hl = "en",
+       tl = "en",
+       sl = nil, -- we don't specify source languagae to detect language
+   },
+   default_lang = "en",
+}
+
+function Translator:getTransServer()
+    return G_reader_settings:readSetting("trans_server") or self.trans_servers[1]
+end
+
+--[[
+--  return decoded JSON table from translate server
+--]]
+function Translator:loadPage(target_lang, source_lang, text)
+    local request, sink = {}, {}
+    local query = ""
+    self.trans_params.tl = target_lang
+    self.trans_params.sl = source_lang
+    for k,v in pairs(self.trans_params) do
+        query = query .. k .. '=' .. v .. '&'
+    end
+    local parsed = url.parse(self:getTransServer())
+    parsed.path = self.trans_path
+    parsed.query = query .. "text=" .. url.escape(text)
+
+    -- HTTP request
+    request['url'] = url.build(parsed)
+    request['method'] = 'GET'
+    request['sink'] = ltn12.sink.table(sink)
+    DEBUG("request", request)
+    http.TIMEOUT, https.TIMEOUT = 10, 10
+    local httpRequest = parsed.scheme == 'http' and http.request or https.request
+    local code, headers, status = socket.skip(1, httpRequest(request))
+
+    -- raise error message when network is unavailable
+    if headers == nil then
+        error("Network is unreachable")
+    end
+
+    local content = table.concat(sink)
+    if content ~= "" then
+        local ok, result = pcall(JSON.decode, JSON, content)
+        if ok and result then
+            --DEBUG("translate result", result)
+            return result
+        else
+            DEBUG("error:", result)
+        end
+    end
+end
+
+function Translator:detect(text)
+    local result = self:loadPage("en", nil, text)
+    if result then
+        local src_lang = result.src
+        DEBUG("detected language:", src_lang)
+        return src_lang
+    end
+end
+
+return Translator
diff --git a/frontend/ui/widget/dictquicklookup.lua b/frontend/ui/widget/dictquicklookup.lua
index 071b0e827..fd232affc 100644
--- a/frontend/ui/widget/dictquicklookup.lua
+++ b/frontend/ui/widget/dictquicklookup.lua
@@ -37,6 +37,8 @@ local DictQuickLookup = InputContainer:new{
     content_face = Font:getFace("cfont", DDICT_FONT_SIZE),
     width = nil,
     height = nil,
+    -- box of highlighted word, quick lookup window tries to not hide the word
+    word_box = nil,
 
     title_padding = Screen:scaleByDPI(5),
     title_margin = Screen:scaleByDPI(2),
@@ -85,6 +87,26 @@ function DictQuickLookup:init()
 end
 
 function DictQuickLookup:update()
+    -- calculate window dimension and try to not hide highlighted word
+    self.align = "center"
+    self.region = Geom:new{
+        x = 0, y = 0,
+        w = Screen:getWidth(),
+        h = Screen:getHeight(),
+    }
+    if self.word_box then
+        local box = self.word_box
+        if box.y + box.h/2 < Screen:getHeight()/2 then
+            self.region.y = box.y + box.h
+            self.region.h = Screen:getHeight() - box.y - box.h
+            self.align = "top"
+        else
+            self.region.y = 0
+            self.region.h = box.y
+            self.align = "bottom"
+        end
+    end
+    self.height = math.min(self.region.h*0.7, Screen:getHeight()*0.5)
     -- dictionary title
     self.dict_title = FrameContainer:new{
         padding = self.title_padding,
@@ -150,9 +172,11 @@ function DictQuickLookup:update()
             {
                 {
                     text = _("Wikipedia"),
-                    enabled = false,
                     callback = function()
-                        self.ui:handleEvent(Event:new("HighlightWiki"))
+                        UIManager:scheduleIn(0.1, function()
+                            self:lookupWikipedia()
+                            self:onClose()
+                        end)
                     end,
                 },
                 {
@@ -225,7 +249,7 @@ function DictQuickLookup:update()
     }
     self[1] = WidgetContainer:new{
         align = self.align,
-        dimen = self.region:copy(),
+        dimen = self.region,
         FrameContainer:new{
             bordersize = 0,
             padding = Screen:scaleByDPI(5),
@@ -336,6 +360,7 @@ function DictQuickLookup:lookupInputWord(hint)
     self:onClose()
     self.input_dialog = InputDialog:new{
         title = _("Input lookup word"),
+        input = hint,
         input_hint = hint or "",
         input_type = "text",
         buttons = {
@@ -369,7 +394,8 @@ end
 function DictQuickLookup:inputLookup()
     local word = self.input_dialog:getInputText()
     if word and word ~= "" then
-        self.ui:handleEvent(Event:new("LookupWord", word))
+        local event = self.wiki and "LookupWikipedia" or "LookupWord"
+        self.ui:handleEvent(Event:new(event, word))
     end
 end
 
@@ -378,4 +404,8 @@ function DictQuickLookup:closeInputDialog()
     UIManager:close(self.input_dialog)
 end
 
+function DictQuickLookup:lookupWikipedia()
+    self.ui:handleEvent(Event:new("LookupWikipedia", self.lookupword, self.word_box))
+end
+
 return DictQuickLookup
diff --git a/frontend/ui/wikipedia.lua b/frontend/ui/wikipedia.lua
new file mode 100644
index 000000000..b75bd9c05
--- /dev/null
+++ b/frontend/ui/wikipedia.lua
@@ -0,0 +1,84 @@
+local socket = require('socket')
+local url = require('socket.url')
+local http = require('socket.http')
+local https = require('ssl.https')
+local ltn12 = require('ltn12')
+local JSON = require("JSON")
+local DEBUG = require("dbg")
+
+--[[
+-- Query wikipedia using Wikimedia Web API.
+-- http://en.wikipedia.org/w/api.php?action=query&prop=extracts&format=json&exintro=&explaintext=&redirects=&titles=hello
+--]]
+
+local Wikipedia = {
+   wiki_server = "http://%s.wikipedia.org",
+   wiki_path = "/w/api.php",
+   wiki_params = {
+       action = "query",
+       prop = "extracts",
+       format = "json",
+       exintro = "",
+       explaintext = "",
+       redirects = "",
+   },
+   default_lang = "en",
+}
+
+function Wikipedia:getWikiServer(lang)
+    return string.format(self.wiki_server, lang or self.default_lang)
+end
+
+--[[
+--  return decoded JSON table from Wikipedia
+--]]
+function Wikipedia:loadPage(text, lang, intro, plain)
+    local request, sink = {}, {}
+    local query = ""
+    self.wiki_params.exintro = intro and "" or nil
+    self.wiki_params.explaintext = plain and "" or nil
+    for k,v in pairs(self.wiki_params) do
+        query = query .. k .. '=' .. v .. '&'
+    end
+    local parsed = url.parse(self:getWikiServer(lang))
+    parsed.path = self.wiki_path
+    parsed.query = query .. "titles=" .. url.escape(text)
+
+    -- HTTP request
+    request['url'] = url.build(parsed)
+    request['method'] = 'GET'
+    request['sink'] = ltn12.sink.table(sink)
+    DEBUG("request", request)
+    http.TIMEOUT, https.TIMEOUT = 10, 10
+    local httpRequest = parsed.scheme == 'http' and http.request or https.request
+    local code, headers, status = socket.skip(1, httpRequest(request))
+
+    -- raise error message when network is unavailable
+    if headers == nil then
+        error("Network is unreachable")
+    end
+
+    local content = table.concat(sink)
+    if content ~= "" then
+        local ok, result = pcall(JSON.decode, JSON, content)
+        if ok and result then
+            DEBUG("wiki result", result)
+            return result
+        else
+            DEBUG("error:", result)
+        end
+    end
+end
+
+-- extract intro passage in wiki page
+function Wikipedia:wikintro(text, lang)
+    local result = self:loadPage(text, lang, true, true)
+    if result then
+        local query = result.query
+        if query then
+            return query.pages
+        end
+    end
+end
+
+return Wikipedia