Definition of Bulb

1. Noun. A modified bud consisting of a thickened globular underground stem serving as a reproductive structure.

Specialized synonyms: Onion, Shallot, Squill, Bulbil, Bulblet
Generic synonyms: Stalk, Stem
Derivative terms: Bulbaceous

2. Noun. Electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity.

3. Noun. A rounded part of a cylindrical instrument (usually at one end). "The bulb of a syringe"
Group relationships: Mercury Thermometer, Mercury-in-glass Thermometer, Syringe
Generic synonyms: Part, Portion
Derivative terms: Bulbous

4. Noun. Anything with a round shape resembling a teardrop.
Generic synonyms: Round Shape
Derivative terms: Bulblike

5. Noun. Lower or hindmost part of the brain; continuous with spinal cord; ('bulb' is an old term for medulla oblongata). "The medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"
Exact synonyms: Medulla, Medulla Oblongata
Generic synonyms: Neural Structure
Group relationships: Brain Stem, Brain-stem, Brainstem
Terms within: Respiratory Center
Derivative terms: Bulbar, Medullary

6. Noun. A rounded dilation or expansion in a canal or vessel or organ.

Definition of Bulb

1. n. A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and producing, as it grows, a stem above, and roots below, as in the onion, tulip, etc. It differs from a corm in not being solid.

2. v. i. To take the shape of a bulb; to swell.

Definition of Bulb

1. Noun. Any solid object rounded at one end and tapering on the other, possibly attached to a larger object at the tapered end ¹

2. Noun. A light bulb ¹

3. Noun. The bulb-shaped root portion of a plant such as a tulip, from which the rest of the plant may be regrown. ¹

¹ Source:

Definition of Bulb

1. an underground bud [n -S] : BULBAR, BULBED [adj]

Medical Definition of Bulb

1. A modified underground stem which has one or more buds enclosed in fleshy modified leaves or scales which supply energy to the bud when they start to grow, onions and tulips have bulbs. (09 Oct 1997)

Bulb Pictures

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Lexicographical Neighbors of Bulb

buke muslin
bulb (current term)
bulb of eye
bulb of hair
bulb of jugular vein
bulb of lateral ventricle
bulb of posterior horn of lateral ventricle of brain
bulbar apoplexy
bulbar conjunctiva
bulbar conjunctivae

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