bulb

Electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity.

Lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata).

A modified bud consisting of a thickened globular underground stem serving as a reproductive structure.

Anything with a round shape resembling a teardrop.

A rounded dilation or expansion in a canal or vessel or organ.

A rounded part of a cylindrical instrument (usually at one end).

“the bulb of a syringe”