[suhb-flawr, -flohr]
a rough floor beneath a finished floor.
Also, subflooring.
Also called blind floor.

sub- + floor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subfloor (ˈsʌbˌflɔː)
a rough floor that forms a base for a finished floor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It should be bonded, not nailed, to the subfloor with latex-cement mortar.
It is nailed or screwed to the subfloor and joist and driven horizontally with
  a punch or nail set.
These are put together in sections on the subfloor and raised, barn-style, by
  two or more people with poles.
Both can eventually cause the floor framing and subfloor layer to flex or warp.
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