Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: pro- + gestation + -one

progesterone

 noun
     
pro‧ges‧ter‧one [uncountable]
HBM a female sex hormone which prepares the body for having a baby, and which is also used in contraceptive drugs
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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