Medical Dictionary


noun con·trac·tion \kən-ˈtrak-shən\

Medical Definition of CONTRACTION

:  the action or process of contracting :  the state of being contracted <contraction of hepatitis> <lung expansion and contraction in breathing—P. G. Donohue>
:  the action of a functioning muscle or muscle fiber in which force is generated accompanied especially by shortening and thickening of the muscle or muscle fiber or sometimes by its lengthening <isometric contraction> <isotonic contraction>; especially :  the shortening and thickening of a functioning muscle or muscle fiber
:  one of usually a series of rhythmic tightening actions of the uterine muscles (as during menstruation or labor)


How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears