| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024bulb /bʌlb/USA pronunciation n. [countable]- Botanya rounded root or underground stem of a plant, such as the onion or tulip.
- any round, enlarged part, esp. at the end of a long object: the bulb of a thermometer.
- Electricitythe part of an incandescent lamp made of glass, through which electricity passes, producing light.
WordReference Random House Unabridged Dictionary of American English © 2024bulb (bulb),USA pronunciation n. - 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.
- Anatomyany of various small, bulb-shaped structures or protuberances:olfactory bulb; bulb of urethra.
- See medulla oblongata.
- Buildinga rounded thickening at the toe of an angle iron or tee.
- Nautical, Naval Termsa cylindrical or spherical prominence at the forefoot of certain vessels.
- Photographya shutter setting in which the shutter remains open as long as the shutter release is depressed. Symbol: B
- Greek bolbós onion, bulbous plant
- Latin bulbus
- 1560–70
Collins Concise English Dictionary © HarperCollins Publishers:: bulb /bʌlb/ n - 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
- a plant, such as a hyacinth or daffodil, that grows from a bulb
- See light bulb
Etymology: 16th Century: from Latin bulbus, from Greek bolbos onion |