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

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

(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.

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

(humorous) form of cease and desist: stop.

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.

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

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