Bulb of a hair

Bulb of a hair
Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo`s: cf. F. bulbe.] 1. (Bot.) 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. [1913 Webster]

2. (Anat.) A name given to some parts that resemble in shape certain bulbous roots; as, the bulb of the aorta. [1913 Webster]

{Bulb of the eye}, the eyeball.

{Bulb of a hair}, the ``root,'' or part whence the hair originates.

{Bulb of the spinal cord}, the medulla oblongata, often called simply bulb.

{Bulb of a tooth}, the vascular and nervous papilla contained in the cavity of the tooth. [1913 Webster]

3. An expansion or protuberance on a stem or tube, as the bulb of a thermometer, which may be of any form, as spherical, cylindrical, curved, etc. --Tomlinson. [1913 Webster]

3. a {light bulb}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Bulb — (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) 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 …   The Collaborative International Dictionary of English

  • Bulb of a tooth — Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) 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 …   The Collaborative International Dictionary of English

  • Bulb of the eye — Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) 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 …   The Collaborative International Dictionary of English

  • Bulb of the spinal cord — Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) 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 …   The Collaborative International Dictionary of English

  • hair bulb — n the bulbous expansion at the base of a hair from which the hair shaft develops * * * bulb of hair bulbus pili …   Medical dictionary

  • bulb — [bulb] n. [ME < L bulbus < Gr bolbos] 1. 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 2. a corm, tuber, or tuberous root resembling a bulb,… …   English World dictionary

  • bulb — 1. Any globular or fusiform structure. SYN: bulbus [TA]. 2. A short, vertical underground stem of plants, such as onion and garlic. [L. bulbus, a bulbous root] aortic b. [TA] the dilated first part of the aorta containing the aort …   Medical dictionary

  • Hair — For other uses, see Hair (disambiguation). Hairy redirects here. For individuals nicknamed the Hairy , see List of people known as the Hairy. Hair Cross section of a hair Latin unguis …   Wikipedia

  • hair — 1. One of the fine, keratinized filamentous epidermal growths arising from the skin of the body of mammals except the palms, soles, and flexor surfaces of the joints; the full length and texture of h. varies markedly in different body sites. SYN …   Medical dictionary

  • hair — n. a threadlike keratinized outgrowth of the epidermis of the skin. It develops inside a tubular hair follicle. The part above the skin consists of three layers: an outer cuticle; a cortex, forming the bulk of the hair and containing the pigment… …   The new mediacal dictionary

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