(sist) noun
1. Any membranous sac or vesicle containing liquid or semisolid material: the biliary cyst, the urinary cyst.
2. Pathol. Any abnormal sac or vesicle in which morbid matter may be collected and retained.
3. Zool. A bladderlike sac, as that with which an embryonic tapeworm surrounds itself; also, a bladderworm.
4. Bot. a A receptacle for oil in the rind of the orange and like fruits. b A cell or cavity containing reproductive bodies in certain cryptogams. c The spore case of a seaweed. [<Gk. kystis bladder <kyein contain]

(sist) noun
A chest; cist. [Var. of CIST]