Terminology by Agile Tortoise is my go-to dictionary and thesaurus app on iOS. Early this year, the app got a major update that transformed it into a full-featured language research tool, complete ...

Besides voice search, the free app offers over 225,000 definitions from Merriam-Webster’s Collegiate Dictionary and 300,000 synonyms and antonyms from Merriam-Webster’s Collegiate Thesaurus.