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cyst

Syllabification: (cyst)

Pronunciation: /sist/

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Definition of cyst

noun

Biology

in an animal or plant, a thin-walled, hollow organ or cavity containing a liquid secretion; a sac, vesicle, or bladder.
Medicine 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.