Category:Vesicle

Ves"i*cle, n. Etym: [l. vesicula, dim. of vesica a bladder, blister; Akin to skr. vasti bladder: cf. F. vésicule.]

Defn: a bladderlike vessel; a membranous cavity; a cyst; a cell. Specifically: --(a) (bot.)

Defn: a small bladderlike body in the substance of vegetable, or upon The surface of a leaf. (b) (med.)

Defn: 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.