A Bulb

1. Any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end.
2. A light bulb.
3. The bulb-shaped root portion of a plant such as a tulip, from which the rest of the plant may be regrown.
4. (nautical) a bulbous protuberance at the forefoot of certain vessels to reduce turbulence.
5. (dated, neuroanatomy) The medulla oblongata.