1936, in the meaning defined above
Share indolebutyric acid
Time Traveler for indolebutyric acid
See more words from the same year
Cite this Entry
“Indolebutyric acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/indolebutyric%20acid. Accessed 12 Aug. 2022.
See Definitions and Examples »
Get Word of the Day daily email!
Commonly Confused Words Quiz
Test your knowledge - and maybe learn something along the way.
A daily challenge for crossword fanatics.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
As illustrated by some very smart pups
Bikini, bourbon, and badminton were places first
Do you take pride in Pride?
Look up any year to find out
How to use a word that (literally) drives some pe...
We're intent on clearing it up
Editor Emily Brewster clarifies the difference.
"The public is a hot mess"
Can you tell a meerkat from a wombat?
Take the quiz
A vocab quiz with panache
Test your knowledge - and maybe learn something a...
Can you outdo past winners of the National Spelli...