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plumb line

noun
1.
a cord with a lead bob attached to one end, used to determine perpendicularity, the depth of water, etc.
Compare plumb (def 1).
Origin
1530-1540
1530-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for plumb lines'

plumb line

noun
1.
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.
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 lines' in Science
plumb line
  (plŭm)   
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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Word Value for plumb

11
16
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