- (v.i.) To take the shape of a bulb; to swell.
- (n.) A name given to some parts that resemble in shape certain bulbous roots; as, the bulb of the aorta.
- (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.
- (n.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). bulb. Retrieved September 20, 2026, from http://smartdefine.org/bulb/definitions/1983006 |
| Chicago | Webster's. 2011. "bulb" http://smartdefine.org/bulb/definitions/1983006 (accessed September 20, 2026). |
| Harvard | Webster's 2011, bulb, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/bulb/definitions/1983006>. |
| MLA | Webster's. "bulb" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/bulb/definitions/1983006> |