Webster
✕

Webster’s Revised Unabridged Dictionary · 1913

Bulb

Bulb (bŭlb), n. [L. bulbus, Gr. βολβός: 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.

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

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.

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.

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

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.