Wikireader - Dictionary Enabled Wikipedia Reader
Wikireader is a website reader with a built in dictionary, primarily targeted at reading wikipedia.
Installation (Android only)
Find it on the play store: Wikireader
Or clone and build it from source.
Usage
Upon installation the app shows a screen that allows one to select the languages they'd like to read in. Tapping the check box activates a language and will prompt the user to select which languages they'd like to translate to. Tapping the language itself will show a list of websites to show for that language.
Once setup is complete, tap the globe icon in the top-left to select a website. While reading e.g. wikipedia, double-tap a word to see its definition in the dictionary.
This is a side-project and still has some rough edges.