- (a.) Perpendicular; vertical; conforming the direction of a line attached to a plumb; as, the wall is plumb.
- (v.t.) To sound with a plumb or plummet, as the depth of water; hence, to examine by test; to ascertain the depth, quality, dimension, etc.; to sound; to fathom; to test.
- (v.t.) To adjust by a plumb line; to cause to be perpendicular; as, to plumb a building or a wall.
- (n.) A little mass or weight of lead or the like, attached to a line, and used by builders, etc., to indicate a vertical direction; a plummet; a plumb bob. See Plumb line, below.
- (adv.) In a plumb direction; perpendicularly.
- (v.t.) To supply, as a building, with a system of plumbing.
- (v.t.) To seal with lead; as, to plumb a drainpipe.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). plumb. Retrieved September 20, 2026, from http://smartdefine.org/plumb/definitions/2046620 |
| Chicago | Webster's. 2011. "plumb" http://smartdefine.org/plumb/definitions/2046620 (accessed September 20, 2026). |
| Harvard | Webster's 2011, plumb, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/plumb/definitions/2046620>. |
| MLA | Webster's. "plumb" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/plumb/definitions/2046620> |