Definition from Wiktionary, the free dictionary
cyst (plural cysts)
- A pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an organ.
- (medicine) Of or pertaining to the urinary bladder or gall bladder (in compounds).
sac which develops in the natural cavities of an organ
From Proto-Germanic *kustuz (“choice, trial”), from Proto-Indo-European *ǵéwstus. Cognate with Old Saxon cust (Dutch kust), Old High German chust, Old Norse kostr (“choose, chance, opportunity, value”).
Declension of cyst (strong i-stem)