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sylvatic
sylviculture
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symbiogenesis
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sympathectomy

sym·pa·thec·to·my [ sìmpə théktəmee ] (plural sym·pa·thec·to·mies)


noun 
Definition:
 
cutting into nervous system: formerly, the surgical interruption of a pathway in the sympathetic nervous system by cutting out a nerve segment

[Early 20th century. <sympathetic + -ectomy]
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