cyst

• a closed sac that develops abnormally in some body structure
• a small anatomically normal sac or bladderlike structure (especially one containing fluid)
• A pouch or sac without opening, usually membranous and containing morbid matter, which is accidentally developed in one of the natural cavities or in the substance of an organ
• In old authors, the urinary bladder, or the gall bladder
• One of the bladders or air vessels of certain algae, as of the great kelp of the Pacific, and common rockweeds (Fuci) of our shores
• A small capsule or sac of the kind in which many immature entozoans exist in the tissues of living animals
• A form assumed by Protozoa in which they become saclike and quiescent. It generally precedes the production of germs

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