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plumb line

a cord with a lead bob attached to one end, used to determine perpendicularity, the depth of water, etc.
Compare plumb (def 1).
1530-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for plumb line
  • The steel tapeline must be attached firmly to a flat surface with clear strapping tape, in a straight, plumb line.
  • Mark a plumb line down the center of one end and a horizontal line perpendicular to it.
  • Think of it as a plumb line from the ears to the knees.
British Dictionary definitions for plumb line

plumb line

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
another name for plumb rule
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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plumb line in Science
plumb line
A line regarded as directed exactly toward the Earth's center of gravity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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