R-value

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R-val·ue

(är′văl′yo͞o)
n.
A measure of the capacity of a material, such as insulation, to impede heat flow, with increasing values indicating a greater capacity. Also called R-factor.

[r(esistance) value.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

R-val•ue

(ˈɑrˌvæl yu)

n.
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. Compare U-value.
[1945–50; R, symbol for resistance]
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