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 trepan trepan /trɪˈpæn/

noun

  1. A drill for cutting circular holes around a center  ( trepan )
    a drill for cutting circular holes around a center
     The surgeon studied the ancient technique of trepanation, using a trepan to make holes in the skull.
    The surgeon studied the ancient technique of trepanation, using a trepan to make holes in the skull.
  2. A surgical instrument used to remove sections of bone from the skull  ( trepan , trephine )
    a surgical instrument used to remove sections of bone from the skull

verb

  1. Cut a hole with a trepan, as in surgery  ( trepan )
    cut a hole with a trepan, as in surgery