Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
What made you want to look up pyrogenesis? Please tell us where you read or heard it (including the quote, if possible).
Test your knowledge of words related to the season of longer days and vacations.
Take the quiz
Test your knowledge of food vocabulary!
Take the quiz
Test your visual vocabulary with our 10-question challenge!
Take the quiz
SCRABBLE® fans, sharpen your skills!
Play the game
