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Definition of plumb rule - 2 dictionary results

plumb rule

–noun
a device for determining perpendicularity, consisting of a narrow board with a plumb line and bob suspended from an upper edge.

Origin:
1350–1400; ME plomreule
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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plumb rule  
n.  A narrow strip of wood with a plumb line hanging from it, used to test verticality.
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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