Plumb line

noun

Definitions

Noun
  1. 1
    A cord with a weight attached, used to produce a vertical line; a plummet.
  2. 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. 3
    Any vertical reference line.

Etymology

From Middle English plumblyne, equivalent to plumb + line.

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