English dictionary poisonous meaning and definition Definition and meaning of poisonous at MeaningMonkey.org. poisonous meaning and definition in the English Dictionary. POISONOUS adjectiveDefinition of poisonous (adjective)having the qualities or effects of a poisonsynonyms: toxicantnot safe to eatmarked by deep ill will; deliberately harmful"poisonous hate"; "venomous criticism"; "vicious gossip"synonyms: venomous, vicious Source: Princeton University Wordnet
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