DICT.TW Dictionary Taiwan

 rar·e·fy /-əˌfaɪ/
 (vt.)使稀少,使稀薄,使純化(vi.)變稀少,變稀薄

 rar·e·fy /ˈrærəˌfaɪ, ˈrɛr-/ 動詞

 Rar·e·fy v. t. [imp. & p. p. Rarefied p. pr. & vb. n. Rarefying ]  To make rare, thin, porous, or less dense; to expand or enlarge without adding any new portion of matter to; -- opposed to condense.

 Rar·e·fy, v. i. To become less dense; to become thin and porous. “Earth rarefies to dew.”
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 rarefy
      v 1: lessen the density or solidity of; "The bones are rarefied"
      2: make more subtle or refined [syn: sublimate, subtilize]
      3: weaken the consistency of (a chemical substance) [syn: attenuate]
      [also: rarefied]