n :  a surgical instrument for cutting out circular sections (as of bone or corneal tissue)
, vt, tre*phined  tre*phin*ing  :  to operate on with or extract by means of a trephine <a graft trephined from a fresh cadaver eye -Yr. Bk. of Eye, Ear, Nose, & Throat>  .
 
 
 
Similar sounding terms:  Dar·von 
 
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