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Plumb line
noun
Definitions
Noun
- 1 A cord with a weight attached, used to produce a vertical line; a plummet.
- 2 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 wordnet
- 3 Any vertical reference line.
Etymology
From Middle English plumblyne, equivalent to plumb + line.
See also for "plumb line"
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