Rarefy



GRE 蓝宝 TOEFL

解释

GRE 红宝书

• v. 使稀薄
• ［类］ 反义词: make more dense ( 使更稠密) ; condense ( 浓缩) ; concentrate ( 浓缩)
• ［记］ rare（稀薄的）+fy

Webster Collegiate

also rarify verb (-fied; -fying)

• Etymology: Middle English rarefien, rarifien, modification of Latin rarefacere, from rarus rare + facere to make — more at do
• Date: 14th century
• transitive verb
  • 1. to make rare, thin, porous, or less dense ; to expand without the addition of matter
  • 2. to make more spiritual, refined, or abstruse
• intransitive verb
  • to become less dense

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