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bulb    音标拼音: [b'ʌlb]
n. 灯泡;球状物

灯泡;球状物

bulb
灯泡

bulb
灯泡

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 [synonym: {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" [synonym: {medulla oblongata}, {medulla}, {bulb}]
6: a rounded dilation or expansion in a canal or vessel or organ

Bulb \Bulb\, v. i.
To take the shape of a bulb; to swell.
[1913 Webster]


Bulb \Bulb\ (b[u^]lb), n. [L. bulbus, Gr. bolbo`s: cf. F.
bulbe.]
1. (Bot.) A spheroidal body growing from a plant either above
or below the ground (usually below), which is strictly a
bud, consisting of a cluster of partially developed
leaves, and producing, as it grows, a stem above, and
roots below, as in the onion, tulip, etc. It differs from
a corm in not being solid.
[1913 Webster]

2. (Anat.) A name given to some parts that resemble in shape
certain bulbous roots; as, the bulb of the aorta.
[1913 Webster]

{Bulb of the eye}, the eyeball.

{Bulb of a hair}, the "root," or part whence the hair
originates.

{Bulb of the spinal cord}, the medulla oblongata, often
called simply bulb.

{Bulb of a tooth}, the vascular and nervous papilla contained
in the cavity of the tooth.
[1913 Webster]

3. An expansion or protuberance on a stem or tube, as the
bulb of a thermometer, which may be of any form, as
spherical, cylindrical, curved, etc. --Tomlinson.
[1913 Webster]

3. a {light bulb}.
[1913 Webster]


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