Dictionary  cystPronunciation: (sist), [key] —n. 1. Pathol.a closed, bladderlike sac formed in animal tissues, containing fluid or semifluid matter. 2. a bladder, sac, or vesicle. 3. Bot., Mycol. a. a sporelike cell with a resistant, protective wall. b. a cell or cavity enclosing reproductive bodies. 4. Zool. a. a sac, usually spherical, surrounding an animal that has passed into a dormant condition. b. such a sac plus the contained animal. c. a capsule or resistant covering. cyst-var. of cysto-, before a vowel: cystectomy. -cystvar. of cysto-, as final element in a compound word: statocyst. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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