Webster's Revised Unabridged Dictionary (1913)
To take the shape of a bulb; to swell.
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.
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.
A name given to some parts that resemble in shape certain bulbous roots; as, the bulb of the aorta.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version
\bulb\ (bŭlb), 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.
of the eye, the eyeball.
of a hair, the "root," or part whence the hair originates.
of the spinal cord, the medulla oblongata, often called simply 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. on.
\bulb\, v. i. to take the shape of a bulb; to swell.
bulb of the eye
bulb of the spinal cord
bulb of a hair
bulb of a tooth
1. a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
(hypernym) stalk, stem
2. electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated
(synonym) light bulb, lightbulb, incandescent lamp, electric light, electric-light bulb
(hypernym) electric lamp
3. a rounded part of a cylindrical instrument (usually at one end); "the bulb of a syringe"
(hypernym) part, portion
(part-holonym) mercury thermometer, mercury-in-glass thermometer
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 functioning"
(synonym) medulla oblongata, medulla
(hypernym) neural structure
(part-holonym) brainstem, brain-stem, brain stem
(part-meronym) respiratory center
5. a rounded dilation or expansion in a canal or vessel or organ
(hypernym) structure, anatomical structure, complex body part, bodily structure, body structure
Dictionary of Automotive Terms
An electronic device which gives off light by the heating of an element contained with a glass enclosure. The metal base which conducts the electricity may be a barrel with locating pins, or it may have small filament wires protruding from the base. In some cases it is a tube with contacts at either end. When replacing bulbs, especially high intensity bulbs like halogen, be sure to avoid touching the glass. The oil from your fingers will cause the bulb to overheat and burn out quickly. If you do touch the glass, you need to clean it with alcohol and air dry it.
Technical English by wpv
The name given to the temperature-sensing device located in the fluid for which control or indication is provided. The bulb may be liquid-filled, gas filled, or gas-and-liquid filled. Changes in temperature produce pressure changes within the bulb which are transmitted to the controller.
Steve's Digicams Digital Camera Dictionary
This is a long time exposure setting - shutter stays open for as long as you keep the shutter release button held down. Time exposure mode. Similar to bulb mode, only the photographer presses the shutter release once to open the shutter and once again to close it. Largely superseded by bulb mode on most cameras, for some reason. Odd, as I think T mode is more convenient to use than bulb, and no harder to implement on automated cameras. However, some cameras have a similar function with their electronic shutter releases, even though it isn’t called T mode. For example, Canon cameras which support the RC-1 infrared remote work like this in bulb mode. One press of the RC-1 shutter release opens the shutter; another press closes it.