Bulb definitions

bŭlb
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.

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A rounded projection or part.

The bulb of a syringe.

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A light bulb.
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A rounded dilation or expansion of a canal, vessel, or organ.
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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.

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A similar underground stem or root, such as a corm, rhizome, or tuber.
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A plant that grows from a bulb.
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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.
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A corm, tuber, or tuberous root resembling a bulb, as in a crocus, dahlia, or cyclamen.
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Any plant that grows from a bulb.
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Anything shaped like a bulb; rounded thing or enlarged part; specif., a lightbulb.

The bulb of a syringe.

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An enlargement on some tissues, organs, or tubes, as at the root of a hair.
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A rounded projection or part.

The bulb of a syringe.

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A rounded dilation or expansion of a canal, vessel, or organ.
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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.
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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.

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A light bulb.
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The bulb-shaped root portion of a plant such as a tulip, from which the rest of the plant may be regrown.
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(nautical) A bulbous protuberance at the forefoot of certain vessels to reduce turbulence.
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(intransitive) To take the shape of a bulb; to swell.
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Origin of bulb

From Middle French bulbe, from Latin bulbus (“bulb, onion”), from Ancient Greek βολβός (bolbos, “plant with round swelling on underground stem”).