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

pregnenolone

play
noun preg·nen·o·lone \preg-ˈne-nə-ˌlōn\

Definition of pregnenolone

  1. :  an unsaturated hydroxy steroid ketone C21H32O2 that is formed by the oxidation of steroids (as cholesterol) and yields progesterone on dehydrogenation



Origin of pregnenolone

International Scientific Vocabulary pregnene (C21H34) + 1-ol + -one


First Known Use: 1936


Medical Dictionary

pregnenolone

play
noun preg·nen·o·lone \preg-ˈnen-əl-ˌōn\

Medical Definition of pregnenolone

  1. :  an unsaturated hydroxy steroid ketone C21H32O2 that is formed by the oxidation of steroids (as cholesterol) and yields progesterone on dehydrogenation




Learn More about pregnenolone


Seen and Heard

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

WORD OF THE DAY

a smart aleck

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?

prompt angry 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