Dictionary

poisonous

adjective poi·son·ous \ˈpiz-nəs, ˈpi-zən-əs\

: causing sickness or death by entering or touching the body : containing poison

: capable of putting poison into another animal's body by biting it

: very harmful or unpleasant

Full Definition of POISONOUS

2
:  having the properties or effects of poison :  venomous
3
poi·son·ous·ly adverb

Examples of POISONOUS

  1. Chocolate is poisonous to dogs.
  2. This species of spider is extremely poisonous.

First Known Use of POISONOUS

1565
POISONOUS Defined for Kids

poisonous

adjective poi·son·ous \ˈpi-zən-əs\

Definition of POISONOUS for Kids

:  containing poison :  having or causing an effect of poison <poisonous mushrooms>
Medical Dictionary

poisonous

adjective poi·son·ous \ˈpiz-nəs, -ən-əs\

Medical Definition of POISONOUS

:  having the properties or effects of poison :  venomous

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