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Noun: rarefaction  ,reh-ru'fak-shun
  1. A decrease in the density of something
    "a sound wave causes periodic rarefactions in its medium"

Derived forms: rarefactions

Type of: decrease, drop-off, lessening

Antonym: compression

Encyclopedia: Rarefaction

Nearest

rapturous
rapturously
raptus
rara avis
rare
rare bird
rare earth
rarebit
rare-earth element
raree-show
rarefaction
rarefied
rarefy
rarely
rareness
rare-roasted
rarified
rarify
raring
rariora
rarity