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rapist
rappa
Rappahannock
rappel
rappel bolting
rappen
rapper
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rarefaction
rar·e·fac·tion [ rèrrə fáksh'n, rérrə faksh'n ] or rar·e·fi·ca·tion [ rèrrəfi káysh'n ]


noun 
Definition:
 
process of thinning: the process of becoming or of making something such as a gas less dense
[Early 17th century. < medieval Latin rarefaction-< past participle of Latin rarefacere (see rarefy)]

rar·e·fac·tion·al adjective
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