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Definition of plumb line - 2 dictionary results

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).
2. plumb rule.

Origin:
1530–40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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plumb line  
n.  
  1. A line from which a weight is suspended to determine verticality or depth.

  2. A line regarded as directed exactly toward the earth's center of gravity.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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