Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

hydroxytryptamine

play
noun hy·droxy·tryp·ta·mine \-ˈtrip-tə-ˌmēn\

Definition of hydroxytryptamine

  1. :  serotonin —usually preceded by the numeral 5 <5-hydroxytryptamine>



1949

First Known Use of hydroxytryptamine

1949


Learn More about hydroxytryptamine


Seen and Heard

What made you want to look up hydroxytryptamine? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to eat gluttonously or ravenously

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

angry prompt maudlin oily
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ