immunosympathectomy

noun
im·​mu·​no·​sym·​pa·​thec·​to·​my | \-ˌsim-pə-ˈthek-tə-mē \
plural immunosympathectomies

Medical Definition of immunosympathectomy 

: 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

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