\Bulb"il\, n. [Dim. fr. bulb.]
1. (Bot.) A small or secondary bulb; hence, now almost
   exclusively: An a["e]rial 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}.

2. (Anat.) A small hollow bulb, such as an enlargement in a
   small vessel or tube.