add. ·noun a small hollow bulb, such as an enlargement in a small vessel or tube.
2. bulbil ·add. ·noun a small or secondary bulb; hence, now almost exclusively: an aerial bulb or deciduous bud, produced in the leaf axils, as in the tiger lily, or relpacing the flowers, as in some onions, and capable, when separated, of propagating the plant;
called also bulblet and brood bud.