2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Cyst \Cyst\ (s[i^]st), n. [Gr. ky`stis bladder, bag, pouch, fr
ky`ein to be pregnant. Cf {Cyme}.]
1. (Med.)
a 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.
b In old authors, the urinary bladder, or the gall
bladder. [Written also {cystis}.]
2. (Bot.) One of the bladders or air vessels of certain
alg[ae], as of the great kelp of the Pacific, and common
rockweeds ({Fuci}) of our shores. --D. C. Eaton.
3. (Zo["o]l.)
a A small capsule or sac of the kind in which many
immature entozoans exist in the tissues of living
animals; also a similar form in Rotifera, etc
b A form assumed by Protozoa in which they become
saclike and quiescent. It generally precedes the
production of germs. See {Encystment}.
From WordNet r 1.6 [wn]:
cyst
n 1: a closed sac that develops abnormally in some body structure
2: a small anatomically normal sac or bladderlike structure
(especially one containing fluid) [syn: {vesicle}]
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