Poi"son*er (?), n. One who poisons. Shak. Poi"son*ous (?), a. Having the qualities or effects of poison; venomous; baneful; corrupting; noxious. Shak. -- Poi"son*ous*ly, adv. -- Poi"son*ous*ness, n. Poi"son*some (?), a. Poisonous.[Obs.] Holland.