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R-value

[ahr-val-yoo]
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noun
  1. a measure of the resistance of an insulating or building material to heat flow, expressed as R-11, R-20, and so on; the higher the number, the greater the resistance to heat flow.
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Origin of R-value

1945–50; R, symbol for resistance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018