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Definition of capsule
1a small case or container, especially a round or cylindrical one. a small, soluble case of gelatin containing a dose of medicine, swallowed whole. 2 Anatomy a tough sheath or membrane that encloses something in the body, such as a kidney, a lens, or a synovial joint. Biology a gelatinous layer forming the outer surface of some bacterial cells. 3the foil or plastic covering the cork of a wine bottle. 4 Botany a dry fruit that releases its seeds by bursting open when ripe, such as a pea pod. 5 Botany the spore-producing structure of mosses and liverworts, typically borne on a stalk. 6 [as modifier] (of a piece of writing) shortened but retaining the essence of the original; condensed:a capsule review of the movie (of a collection of clothing) consisting of a relatively small set of key items.