'Poisonous' definitions:

Definition of 'poisonous'

From: WordNet
adjective
Having the qualities or effects of a poison [syn: poisonous, toxicant]
adjective
Not safe to eat
adjective
Marked by deep ill will; deliberately harmful; "poisonous hate"; "venomous criticism"; "vicious gossip" [syn: poisonous, venomous, vicious]

Definition of 'Poisonous'

From: GCIDE
  • Poisonous \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. [1913 Webster]