[ves.i.cle] n [MF vesicule, fr. L vesicula small bladder, blister, fr. dim. of vesica] (1578) 1 a: a membranous and usu. fluid-filled pouch (as a cyst, vacuole, or cell) in a pla nt or animal b: a small abnormal elevation of the outer layer of skin enclosing a watery liquid: blister c: a pocket of embryonic tissue that is the beginning of an organ
2: a small cavity in a mineral or rock