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

L–tryptophan

play
noun L–tryp·to·phan \ˈel-ˈtrip-tə-ˌfan\

Definition of L–tryptophan

  1. :  the levorotatory form of tryptophan that is a precursor of serotonin and was used formerly as a dietary supplement especially to promote sleep and relieve depression



1949

First Known Use of l–tryptophan

1949


Medical Dictionary

L–tryptophan

play
noun L–tryp·to·phan \ˈel-ˈtrip-tə-ˌfan\

Medical Definition of L–tryptophan

  1. :  the levorotatory form of tryptophan that is a precursor of serotonin and was formerly used in some health food preparations in the belief that it promoted sleep and relieved depression—see eosinophilia-myalgia syndrome




Seen and Heard

What made you want to look up L–tryptophan? 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?

oily maudlin prompt angry
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