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1. Oxford American Dictionary

   rarefaction

   • IPA[ˌrerəˈfakSH(ə)n]

   美式

   • n.
     diminution in the density of something, especially air or a gas；the lessening of density of tissue, especially of nervous tissue or bone

   • noun: rarefaction, plural noun: rarefactions

2. • 釋義

   n.

   名詞

   • 1. diminution in the density of something, especially air or a gas opposed processes such as rarefaction and condensation a series of rarefactions and compactions
   • ▪ the lessening of density of tissue, especially of nervous tissue or bone the cord has undergone rarefaction
3. • 更多解釋

   rarefaction

   • IPA[ˌrɛːrɪˈfakʃn]

   英式

   • n.
     reduction in the density of something, especially air or a gas: opposed processes such as rarefaction and condensation a series of rarefactions and compactions

   Oxford Dictionary