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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occurring twice a year or every two years

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