The Collaborative International Dictionary of English v.0.48:

Necrotomy \Nec*rot"o*my\, n. [Gr. nekro`s dead person + te`mnein
   to cut.] (Med.)
   The dissection of dead bodies; also, excision of necrosed
   bone. -- Nec`ro*tom"ic, a. -- Nec*rot"o*mist, n.
   [Webster 1913 Suppl.]