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Entry 2 senses · 2 variants Webster, 1913

Rarefy

/(răr"ē̇*fī; 277)/ · Rar·e·fy · IPA /ˈɹɛəɹəˌfaɪ/
01 v. t. To make rare, thin, porous, or less dense; to expand or enlarge without adding any new portion of matter to; -- opposed to condense.
imp. & p. p. Rarefied; p. pr. & vb. n. Rarefying
  1. 1.
    To make rare, thin, porous, or less dense; to expand or enlarge without adding any new portion of matter to; -- opposed to condense.
02 v. i. To become less dense; to become thin and porous.
  1. 1.
    To become less dense; to become thin and porous.