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R & D
R/D
R.E.
r.f.
R factor
r.h.p.
r.m.m.
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R-value
RA
Ra (1)
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R-value
R-value (plural R-values)


noun 
Definition:
 
measure of insulation ability: a measure of the ability of a material such as insulation to retard heat flow. A higher number indicates better insulating properties.
[Mid-20th century. <r2 'resistance']
Encarta® World English Dictionary [World English Edition] © & (P)2008 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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