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noun Vesicle n. A bladderlike vessel; a membranous cavity; a cyst; a cell. Specifically: (a)(Bot.) A small bladderlike body in the substance of a vegetable, or upon the surface of a leaf. (b)(Med.) A small, and more or less circular, elevation of the cuticle, containing a clear watery fluid. (c)(Anat.) A cavity or sac, especially one filled with fluid; as, the umbilical vesicle. (d)(Zool.) A small convex hollow prominence on the surface of a shell or a coral. (e)(Geol.) A small cavity, nearly spherical in form, and usually of the size of a pea or smaller, such as are common in some volcanic rocks. They are produced by the liberation of watery vapor in the molten mass.
Collaborative International Dictionary of English 0.48
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