One who practices or advocates vivisection; a vivisector.(noun)
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Use "vivisectionist" in a sentence
"The stereotype of the cruel "vivisectionist" that ALF and its fellow radicals like to promote just isn't true."
"In The Island of Dr Moreau the visionary vivisectionist performs vile experiments on animals with the aim of remaking them as humans."
"Or else he probes them with the cruel hand of a vivisectionist, groping about in their mental processes and examining their souls as though to see of what soul-stuff is made."