- Little sac or cyst - A bladderlike vessel; a membranous cavity; a cyst; a cell. - A small bladderlike body in the substance of vegetable, or
upon the surface of a leaf. - A small, and more or less circular, elevation of the
cuticle, containing a clear watery fluid. - A cavity or sac, especially one filled with fluid; as, the
umbilical vesicle. - A small convex hollow prominence on the surface of a shell
or a coral. - 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.