bulb
n 1: a modified bud consisting of a thickened globular
underground stem serving as a reproductive structure
2: a glass bulb containing a wire filament (usually tungsten)
that emits light when heated [syn: {light bulb}, {lightbulb},
{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: 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 funtioning" [syn: {medulla oblongata}, {medulla}]
5: a rounded dilation or expansion in a canal or vessel or
organ