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1. Oxford Dictionary

   rarefy

   • IPA[ˈrɛːrɪfʌɪ]

   英式

   • v.
     make or become less dense or solid

   • verb: rarefy, 3rd person present: rarefies, gerund or present participle: rarefying, past tense: rarefied, past participle: rarefied

2. • 釋義

   v.

   動詞

   • 1. make or become less dense or solid air rarefies and degrounds the physical body as the shell continues to expand and rarefy, astronomers may eventually be able to see characteristic gamma rays from the radioactivity within