1958, in the meaning defined above
“5-HT.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/5-HT. Accessed 11 Dec. 2023.
Britannica.com: Encyclopedia article about 5-HT
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
See Definitions and Examples »
Get Word of the Day daily email!