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vesicle
WordNet 2.0
  • a small anatomically normal sac or bladderlike structure (especially one containing fluid)
vesicle
Webster's Revised Unabridged Dictionary (1913)
  • 1. A bladderlike vessel; a membranous cavity; a cyst; a cell. Specifically: --

    (a) (Bot.) A small bladderlike body in the substance of 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) (Zoöl.) 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.

 

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