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subfloor

[suhb-flawr, -flohr]
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noun
  1. a rough floor beneath a finished floor.
Often sub·floor·ing.

Origin of subfloor

Also called blind floor.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for subfloor

subfloor

noun
  1. a rough floor that forms a base for a finished floor
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