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The Collaborative International Dictionary
Veneficiously

Veneficial \Ven`e*fi"cial\, Veneficious \Ven`e*fi"cious\, a. Acting by poison; used in poisoning or in sorcery. [Obs.] ``An old veneficious practice.''
--Sir T. Browne. -- Ven`e*fi"cious*ly, adv. [Obs.]