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Definition of Poisonous
1. Adjective. Having the qualities or effects of a poison.
2. Adjective. Not safe to eat.
3. Adjective. Marked by deep ill will; deliberately harmful. "Vicious gossip"
Definition of Poisonous
1. a. Having the qualities or effects of poison; venomous; baneful; corrupting; noxious.
Definition of Poisonous
1. [adj]
Medical Definition of Poisonous
1. Characterised by, having the characteristics of, or containing a poison. Synonym: toxic, toxicant, toxiferous, venenous. (05 Mar 2000)