'Craniotomy' definitions:

Definition of 'craniotomy'

(from WordNet)
noun
A surgical opening through the skull

Definition of 'Craniotomy'

From: GCIDE
  • Craniotomy \Cra`ni*ot"o*my\ (kr?`n?-?t"?-m?), n. [Cranium + Gr. ???? to cut off.] (Med.) The operation of opening the fetal head, in order to effect delivery. [1913 Webster]