Lexicon-A App for iOS
'"Lexicon-A" Dictionary is an offline reference for the English language. The design of it dedicates in speed, reliability and simplicity.
* English-English Dictionary.
* Adjustable Display Font Size.
* Invert Black/White in Low-Lux Reading Environment.
* Bookmark for the Vocabulary.
* Recent Searches.
* Correlative Prefix Search.
* Support External Search Link by Browser.'
This is a free app