bulla

bulla ae, f

a water-bubble, bubble: perlucida, O.—A boss, knob (upon a door): bullae aureae.— A stud (in a girdle): notis fulserunt cingula bullis, V.—An amulet worn upon the neck by boys of free birth (mostly of gold): sine bullā venerat: filio bullam relinquere, L.—Orig. an Etruscan custom; hence, Etruscum aurum, Iu.: bullā dignissime, i. e. childish, Iu.—On the forehead of a pet stag, O.