Nearby Words

r-value

[ahr-val-yoo]

R-val·ue

[ahr-val-yoo]
noun
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.


Origin:
1945–50; R, symbol for resistance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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R-value is always a great word to know.
So is callithumpian. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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