from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A narrow strip of wood with a plumb line hanging from it, used to test verticality.

from The Century Dictionary.

  • noun A narrow board with parallel edges having a straight line drawn through the middle, and a string carrying a metal weight attached at the upper end of the line. It is used by masons, bricklayers, carpenters, etc., for determining a vertical.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a plumb line attached to a narrow board


Sorry, no etymologies found.


Help support Wordnik (and make this page ad-free) by adopting the word plumb rule.


    Sorry, no example sentences found.


Log in or sign up to get involved in the conversation. It's quick and easy.