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noun
1.
Botany.
a.
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.
b.
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.
a.
the glass housing, in which a partial vacuum has been established, that contains the filament of an incandescent electric lamp.
b.
an incandescent or fluorescent electric lamp.
4.
EXPANDAnatomy. 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.
COLLAPSEPhotography. 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
1560–70; < Latin bulbus < Greek bolbós onion, bulbous plant
Related forms
bulbed, adjective
bulb·less, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Bulbed
is always a great word to know.
So is flibbertigibbet. Does it mean:
| a chattering or flighty, light-headed person. |
| a gadget; dingus; thingumbob. |
Etymonline
Word Origin & History
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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American Heritage
Medical Dictionary
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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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
bulb  (bŭlb) Pronunciation Key
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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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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