n. | 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. |
| 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. |
| 3. | a light bulb. |
v. i. | 1. | To take the shape of a bulb; to swell. |
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