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1. A line from which a weight is suspended to determine verticality or depth.
2. An imaginary line regarded as directed exactly toward the earth's center of gravity.
1. (Navigation) a string with a metal weight at one end that, when suspended, points directly towards the earth's centre of gravity and so is used to determine verticality, the depth of water, etc
2. (Building) another name for plumb rule
1. a cord with a lead bob attached to one end, used to determine perpendicularity, the depth of water, etc. Compare plumb (def. 1).
2. plumb rule.
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|Noun||1.||plumb line - a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point|
cord - a line made of twisted fibers or threads; "the bundle was tied with a cord"
plumb rule - a plumb line attached to a narrow board