bulb
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Definition of 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 |