Bulb - Definition
bulb
n 1: a modified bud consisting of a thickened globular
underground stem serving as a reproductive structure
2: electric lamp consisting of a transparent or translucent
glass housing containing a wire filament (usually tungsten)
that emits light when heated by electricity [syn: light
bulb, lightbulb, bulb, incandescent lamp, electric
light, electric-light bulb]
3: a rounded part of a cylindrical instrument (usually at one
end); "the bulb of a syringe"
4: anything with a round shape resembling a teardrop
5: 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" [syn: medulla oblongata, medulla, bulb]
6: a rounded dilation or expansion in a canal or vessel or organ