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:
circa 1926, in the meaning defined above
allantoin + -ase
Time Traveler for allantoinase
See more words from the same year
Cite this Entry
“Allantoinase.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/allantoinase. Accessed 27 Nov. 2021.
See Definitions and Examples »
Get Word of the Day daily email!
Name that Thing: Flower Edition
Test your vocabulary with our 10-question quiz!
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Top 10 Latin Phrases
Is the project green-lighted? Or greenlit?
Just to get the blood flowing
Where the "Green-Eyed Monster" Comes from
A simple trick to keep them separate
How 'literally' can mean "figuratively"
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
How many do you know?
Take the quiz
It's a whole mood