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 Semisulcospira? 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 knowledge - and maybe learn something along the way.
Take the quiz
Build a city of skyscrapers—one synonym at a time.
Play the game
