Merriam-Webster API
Merriam-Webster (merriam-webster.com) has 3 public methods: define word, get synonyms and get Merriam-Webster Word of the Day. Each costs 1 credit per completed run (1¢ with pay as you go); failed runs are free.
Unofficial. Not affiliated with or endorsed by Merriam-Webster.
Methods
3Looks up a word or phrase in Merriam-Webster's dictionary and returns its pronunciation, definitions, examples and word history.
Returns headword, pronunciation, audio link, page link, entries with definitions, examples, etymology, first known use
Readmerriam-webster.com/define_wordLooks up a word on its public Merriam-Webster thesaurus page and returns each meaning with its example, synonyms, antonyms and related words.
Returns meanings with part of speech, example, synonyms, antonyms, related words, thesaurus link
Readmerriam-webster.com/get_synonymsGets Merriam-Webster's Word of the Day for today or a past archive date, with its meaning, example, pronunciation and background note. Dates without a published entry are unavailable.
Returns date, word, part of speech, pronunciation, definition, example sentence, did you know note, link
Readmerriam-webster.com/get_word_of_the_day