1949, in the meaning defined above
Time Traveler for hydroxytryptamine
See more words from the same year
Cite this Entry
“Hydroxytryptamine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydroxytryptamine. Accessed 2 Dec. 2021.
More from Merriam-Webster on hydroxytryptamine
Britannica.com: Encyclopedia article about hydroxytryptamine
See Definitions and Examples »
Get Word of the Day daily email!
Farm Idioms Quiz
Can you spell these 10 commonly misspelled words?
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Top 10 Latin Phrases
This is usage
Our Word of the Year 'vaccine,' plus 10 more
From the week ending 11/26/2021
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