anti-vivisection
adjective
an·ti-viv·i·sec·tion ˌan-tē-ˌvi-və-ˈsek-shən 
-ˈvi-və-ˌsek-,
ˌan-tī-
: opposed to experimentation on living animals especially when considered to cause pain or distress to the subject : opposed to vivisection
anti-vivisection ads
an anti-vivisection organization
anti-vivisectionist
ˌan-tē-ˌvi-və-ˈsek-sh(ə-)nist
noun ˌan-tī-
… it is cogent to say that I am a strong anti-vivisectionist. 
G. K. Chesterton
G. K. Chesterton 
Word History
First Known Use
1863, in the meaning defined above
Medical Definition
anti-vivisection
noun
an·ti-vivi·sec·tion ˌant-i-ˌviv-ə-ˈsek-shən, ˌan-ˌtī-, -ˈviv-ə-ˌ
often attributive
: opposition to animal experimentation and especially vivisection
the anti-vivisection movement