plumb rule


noun

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

Nearby words

  1. plumate,
  2. plumb,
  3. plumb bob,
  4. plumb joint,
  5. plumb line,
  6. plumb-bob,
  7. plumbaginaceous,
  8. plumbaginous,
  9. plumbago,
  10. plumbeous

Origin of plumb rule

1350–1400; Middle English plomreule

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for plumb rule

plumb rule

noun

a plumb line attached to a narrow board, used by builders, surveyors, etc
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