1. (n.) A bladder like vessel; a membranous cavity; a cyst; a cell.

2. (n.) A small bladder like body in the substance of vegetable, or upon the surface of a leaf.

3. (n.) A small, and more or less circular, elevation of the cuticle, containing a clear watery fluid.

4. (n.) A cavity or sac, especially one filled with fluid; as, the umbilical vesicle.

5. (n.) A small convex hollow prominence on the surface of a shell or a coral.

6. (n.) 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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