A man holding a bulb from which a flowering plant is sprouting.
- The definition of a bulb is an underground bud of a plant, or something resembling its rounded or elongated shape.
- An example of a bulb is an onion.
- An example of a bulb is an electric light bulb.
- an underground bud that sends down roots and consists of a very short stem covered with leafy scales or layers, as in a lily, onion or hyacinth
- a corm, tuber, or tuberous root resembling a bulb, as in a crocus, dahlia or cyclamen
- any plant that grows from a bulb
- anything shaped like a bulb; rounded thing or enlarged part: an electric light bulb, the bulb of a syringe
- an enlargement on some tissues, organs, or tubes, as at the root of a hair
- Obsolete medulla oblongata
Origin of bulbMiddle English ; from Classical Latin bulbus ; from Classical Greek bolbos
- Botany a. A short, modified, underground stem surrounded by usually fleshy modified leaves that contain stored food for the shoot within: an onion bulb; a tulip bulb.b. A similar underground stem or root, such as a corm, rhizome, or tuber.c. A plant that grows from a bulb.
- A rounded projection or part: the bulb of a syringe.
- A light bulb.
- Anatomy A rounded dilation or expansion of a canal, vessel, or organ.
Origin of bulbLatin bulbus, from Greek bolbos, bulbous plant.
- Any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end.
- the bulb of the aorta
- A light bulb.
- The bulb-shaped root portion of a plant such as a tulip, from which the rest of the plant may be regrown.
- (nautical) a bulbous protuberance at the forefoot of certain vessels to reduce turbulence.
(third-person singular simple present bulbs, present participle bulbing, simple past and past participle bulbed)
- (intransitive) To take the shape of a bulb; to swell.
From Middle French bulbe, from Latin bulbus (“bulb, onion”), from Ancient Greek βολβός (bolbos, “plant with round swelling on underground stem”).