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poisonous vs. venomous

poisonous

[ poi-zuh-nuhs ]
adjective
  1. full of or containing poison: poisonous air; a poisonous substance.
  2. harmful; destructive: poisonous to animals; poisonous rumors.
  3. deeply malicious; malevolent: poisonous efforts.

venomous

[ ven-uh-muhs ]
adjective
  1. (of an animal) having a gland or glands for secreting venom; able to inflict a poisoned bite, sting, or wound: a venomous snake.
  2. full of or containing venom; poisonous: a venomous wound; a venomous potion.
  3. spiteful; malignant: a venomous attack; a venomous tongue.