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1: A membranous and usually fluid-filled pouch (as a cyst, vacuole, or cell) in a plant or animal. 2: A small abnormal elevation of the outer layer of skin enclosing a watery liquid: blister. 3: A pocket of embryonic tissue that is the beginning of an organ.

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: February 1, 2016