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A sac or capsule filled with fluid.

Definition from:  National Cancer Institute dictionaryThis link leads to a site outside Genetics Home Reference.

1: A closed sac having a distinct membrane and developing abnormally in a body cavity or structure. 2: A body resembling a cyst: as a) a capsule formed about a minute organism going into a resting or spore stage; also: this capsule with its contents b) a resistant cover about a parasite produced by the parasite or the host.

Definition from: Merriam-Webster's Medical DictionaryThis link leads to a site outside Genetics Home Reference. by Merriam-Webster Inc.

See also Understanding Medical Terminology.

Published: November 23, 2015