bulb

[buhlb] /bʌlb/
noun
1.
Botany.
  1. a usually subterranean and often globular bud having fleshy leaves emergent at the top and a stem reduced to a flat disk, rooting from the underside, as in the onion and lily.
  2. a plant growing from such a bud.
2.
any round, enlarged part, especially at the end of a cylindrical object:
"the bulb of a thermometer."
3.
Electricity.
  1. the glass housing, in which a partial vacuum has been established, that contains the filament of an incandescent electric lamp.
  2. an incandescent or fluorescent electric lamp.
4.
Anatomy. any of various small, bulb-shaped structures or protuberances:
"olfactory bulb; bulb of urethra."
6.
Building Trades. a rounded thickening at the toe of an angle iron or tee.
7.
Nautical. a cylindrical or spherical prominence at the forefoot of certain vessels.
8.
Photography. a shutter setting in which the shutter remains open as long as the shutter release is depressed. Symbol: B.
Origin
1560–70; < Latin bulbus < Greek bolbós onion, bulbous plant
Related forms
bulbed, adjective
bulbless, adjective
Example Sentences for bulb
The common incandescent light bulb will soon become a lot less common.
Two of the switches do nothing, but one of them controls a bulb on the second floor.
When prices fall, the bulb will dim and the country could be plunged back into darkness.
In standard flash photography, a bulb on the camera releases a burst of light.
In containers, plant in porous mix with bulb tip near the surface.
It's still spring, and bulb planting season is months away.
The bulb foliage may fade, but the rocks act as place markers forever.
Every spring bulb is a perfect package, containing everything necessary for a splendid spring flower show.
Rosemary bushes are full of blue flowers, bulb blossoms are starting to crack open, and spring blooms are budded up ready to go.
Unscrew a light bulb that uses a lot of electricity and replace it with one that uses much less.
British Dictionary definitions for bulb
bulb (bʌlb)
 
n
1.  Compare corm a rounded organ of vegetative reproduction in plants such as the tulip and onion: a flattened stem bearing a central shoot surrounded by fleshy nutritive inner leaves and thin brown outer leaves
2.  a plant, such as a hyacinth or daffodil, that grows from a bulb
3.  See light bulb
4.  a rounded part of an instrument such as a syringe or thermometer
5.  anatomy a rounded expansion of a cylindrical organ or part, such as the medulla oblongata
6.  Also called: bulbous bow a bulbous protuberance at the forefoot of a ship to reduce turbulence
 
[C16: from Latin bulbus, from Greek bolbos onion]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for bulb
bulb
1560s, "an onion," from M.Fr. bulbe, from L. bulbus "bulb, onion," from Gk. bolbos "plant with round swelling on underground stem." Expanded by 1800 to "swelling in a glass tube" (thermometer bulb, light bulb, etc.).
Online Etymology Dictionary, © 2010 Douglas Harper
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bulb in Medicine

bulb (bŭlb)
n.
A globular or fusiform anatomical structure or enlargement.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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bulb in Science
bulb
  (bŭlb)   
A rounded underground storage organ that contains the shoot of a new plant. A bulb consists of a short stem surrounded by fleshy scales (modified leaves) that store nourishment for the new plant. Tulips, lilies, and onions grow from bulbs. Compare corm, rhizome, runner, tuber.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang related to bulb

bulb

noun

dim bulb (1960s+)


Dictionary of American Slang
Copyright © 1986 by HarperCollins Publishers
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Difficulty index for bulb

All English speakers likely know this word

Tile value for bulb

8
12
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