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.

Enclosed in a cyst.

plural of cyst

Any collection of fluid, surrounded by a very thin wall, within an ovary; any ovarian follicle that is larger than about two centimeters is termed an ovarian cyst.

(pathology) A swelling on or around joints and tendons in the hand or foot.

An ovarian cyst containing old brown blood, usually, but not always, associated with endometriosis.

(pathology) A type of teratoma or tumour, usually benign. It is in the form of a cyst or sac, and contains skin and sometimes hair, nails, teeth or other tissue.

A benign swelling of the semimembranosus or more rarely some other synovial bursa found behind the knee joint.

(humorous) form of cease and desist: stop.

(medicine) A fluid-filled cyst near the vagina, caused by the blockage of a Bartholin's gland.