Definitions for bulb

(a modified bud consisting of a thickened globular underground stem serving as a reproductive structure)

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

(a rounded part of a cylindrical instrument (usually at one end); "the bulb of a syringe")

(anything with a round shape resembling a teardrop)

(lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata); "the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning")

(a rounded dilation or expansion in a canal or vessel or organ)