A unit of measurement equal to approximately three-thousandths of an inch - approximately the thickness of a sheet of paper. Frequently used in industrial and construction environments.
"Move that board over just a cunthair before you nail it in place."
by KPY February 07, 2008
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Again used for small measurements, typically used in Canadian construction. Can be altered by adding in "Make it a red head", which usually means, just a little more.
Hey Bob, cut a cunthair off that 1/2 inch copper pipe. Make it a red head.
by Rocketman1973 December 14, 2011
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Smallest unit of measurement used in everyday American construction industry
It's a cunthair off level/plumb/square etc.
Take and cut a cunthair off this 2x4.
by Englethrope B Squeebe December 28, 2007
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