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underlayment

[uhn-der-ley-muh nt]
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noun
  1. material laid between a subfloor and a finish floor of linoleum, asphalt tile, etc.
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Origin of underlayment

First recorded in 1945–50; underlay + -ment
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018