Medical Dictionary


noun \ˈsist\

Medical Definition of CYST

:  a closed sac having a distinct membrane and developing abnormally in a body cavity or structure
:  a body resembling a cyst: as a :  a capsule formed about a minute organism going into a resting or spore stage; also :  this capsule with its contents b :  a resistant cover about a parasite produced by the parasite or the host—compare hydatid 2a
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