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单词 atavism
释义 atavism
 —atavist,  n.  
 /at"euh viz'euhm/,  n.  
  1.  Biol.  
   a. the reappearance in an individual of characteristics of some remote ancestor that have been absent in intervening generations.
   b. an individual embodying such a reversion.
  2. reversion to an earlier type; throwback.
 [1825-35; < L atav(us) remote ancestor (at-, akin to atta familiar name for a grandfather + avus grandfather, forefather) + -ISM]
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