'Vivisectionist' definitions:

Definition of 'vivisectionist'

(from WordNet)
noun
A biologist who cuts open live animals for research

Definition of 'Vivisectionist'

From: GCIDE
  • Vivisectionist \Viv`i*sec"tion*ist\, n. One who practices or advocates vivisection; a vivisector. [1913 Webster]