Ves"i*cle (?), n. [L. vesicula, dim. of vesica a bladder, blister; akin to Skr. vasti bladder: cf. F. v'esicule.]
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) 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.
© Webster 1913.