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Rare
rare bird
rare earth
rare earth element
rare earth metal
rare-earth element
rare-roasted
rarebit
raree-show
Rareeshow
rarefactional
Rarefiable
rarefied
Rarefy
Rarefying
Rarely
Rareness
Rarer
Rareripe
Rarest
rariba
rarida
Rarification

Rarefaction definitions

Webster's 1828 Dictionary

RAREFAC'TION, n. [See Rarefy.]
The act or process of expanding or distending bodies, by separating the parts and rendering the bodies more rare or porous, by which operation they appear under a larger bulk, or require more room, without an accession of new matter; opposed to condensation; as the rarefaction of air.

WordNet (r) 3.0 (2005)

n
1: a decrease in the density of something; "a sound wave causes periodic rarefactions in its medium"

Merriam Webster's

noun Etymology: French or Medieval Latin; French raréfaction, from Medieval Latin rarefaction-, rarefactio, from Latin rarefacere to rarefy Date: 1572 1. the action or process of rarefying 2. the quality or state of being rarefied 3. a state or region of minimum pressure in a medium traversed by compressional waves (as sound waves) • rarefactional adjective

Webster's 1913 Dictionary

Rarefaction Rar`e*fac"tion, n. [Cf. F. rar['e]faction. See Rarefy.] The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air.



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