Definitions for: Bulb


[n] a rounded part of a cylindrical instrument (usually at one end); "the bulb of a syringe"
[n] electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated
[n] a rounded dilation or expansion in a canal or vessel or organ
[n] 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"
[n] a modified bud consisting of a thickened globular underground stem serving as a reproductive structure



Webster (1913) Definition: 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.

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

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.

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.


Bulb, v. i.
To take the shape of a bulb; to swell.

Synonyms: electric light, electric-light bulb, incandescent lamp, light bulb, lightbulb, medulla, medulla oblongata

See Also: anatomical structure, bodily structure, body structure, bulbil, bulblet, complex body part, electric lamp, filament, hindbrain, mercury thermometer, mercury-in-glass thermometer, neural structure, onion, part, portion, respiratory center, rhombencephalon, shallot, squill, stalk, stem, structure, syringe

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