immunosympathectomy

noun

im·​mu·​no·​sym·​pa·​thec·​to·​my -ˌsim-pə-ˈthek-tə-mē 

plural immunosympathectomies

: the destruction of neurons of the sympathetic nervous system in newborn laboratory animals (as mice or rats) by the injection of antiserum to nerve growth factor

immunosympathectomized adjective

or chiefly British immunosympathectomised

-ˌmīzd