Source : Webster's Revised Unabridged Dictionary (1913)

Vivisect \Viv"i*sect`\, v. t.
   To perform vivisection upon; to dissect alive. [Colloq.]
   --Pop. Sci. Monthly.

Source : WordNet®

vivisect
     v : cut (a body) open while still alive; "people no longer
         vivisect animals--it's considered unethical"