Botany .

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.

a plant growing from such a bud.

any round, enlarged part, esp. at the end of a cylindrical object

the bulb of a thermometer.

Electricity .

the glass housing, in which a partial vacuum has been established, that contains the filament of an incandescent electric lamp.

an incandescent or fluorescent electric lamp.

Anatomy . any of various small, bulb-shaped structures or protuberances

olfactory bulb; bulb of urethra.

medulla oblongata.

Building Trades . a rounded thickening at the toe of an angle iron or tee.

Nautical . a cylindrical or spherical prominence at the forefoot of certain vessels.

Photography . a shutter setting in which the shutter remains open as long as the shutter release is depressed. Symbol

B

noun

ball , bunch , corm , corn , globe , head , knob , nodule , nub , protuberance , swelling , tuber , tumornotes:tubers are different from bulbs and corms in that they have no basal plate or enveloping leaves , bud , expansion , garlic , lamp , node , onion , plant , root , seed , swell , tulip