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knothole

American  
[not-hohl] / ˈnɒtˌhoʊl /

noun

  1. a hole in a board or plank formed by the falling out of a knot or a portion of a knot.


knothole British  
/ ˈnɒtˌhəʊl /

noun

  1. a hole in a piece of wood where a knot has been

"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

Etymology

Origin of knothole

First recorded in 1720–30; knot 1 + hole