Etymology
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cyst (n.)

"bladder-like bag or vesicle in an animal body," 1713, from Modern Latin cystis (in English as a Latin word from 1540s), from Greek kystis "bladder, pouch," which is of uncertain etymology.

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Definitions of cyst

cyst (n.)
a closed sac that develops abnormally in some body structure;
cyst (n.)
a small anatomically normal sac or bladderlike structure (especially one containing fluid);
Synonyms: vesicle
From wordnet.princeton.edu