cyst

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cyst / sist/ • n. Biol. in an animal or plant, a thin-walled, hollow organ or cavity containing a liquid secretion; a sac, vesicle, or bladder. ∎  Med. in the body, a membranous sac or cavity of abnormal character containing fluid. ∎  a tough protective capsule enclosing the larva of a parasitic worm or the resting stage of an organism.

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