cyst
noun
1.
a closed sac that develops abnormally in some body structure
2.
a small anatomically normal sac or bladderlike structure (especially one containing fluid)
Origin
From Late Latin cystis, from Ancient Greek κύστις (kústis, “anatomical sac”).
Related words
Word family
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.