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trephine

tre·phine

trephine

pronunciation:
trih faIn [or] trih fin
parts of speech:
noun, transitive verb
part of speech: noun
definition: a circular surgical saw, mounted on a shaft and operated by a lateral handle, used to remove disks of bone, esp. from the skull.
 
part of speech: transitive verb
inflections: trephined, trephines, trephining
definition: to use a trephine on.