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living fossil noun

  /ˈlɪvɪŋ ˈfɑsl̩/ , /ˈlɪvɪŋ ˈfɒsl̩/
  • (evolutionary theory) Any species discovered first as a fossil and believed extinct, but which is later found living; an organism that has remained unchanged over geological periods. [from 1859]
 fòssil vivent
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