poisonous

play
adjective poi·son·ous \ˈpȯiz-nəs, ˈpȯi-zən-əs\

Definition of poisonous

  1. 1 :  destructive, harmful

  2. 2 :  having the properties or effects of poison :  venomous

  3. 3 :  spiteful, malicious

poisonously

adverb

Examples of poisonous in a sentence

  1. Chocolate is poisonous to dogs.

  2. This species of spider is extremely poisonous.

1565

First Known Use of poisonous

1565


POISONOUS Defined for English Language Learners

poisonous

play
adjective poi·son·ous \ˈpȯiz-nəs, ˈpȯi-zən-əs\

Definition of poisonous for English Language Learners

  • : 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


POISONOUS Defined for Kids

poisonous

play
adjective poi·son·ous \ˈpȯi-zən-əs\

Definition of poisonous for Students

  1. :  containing poison :  having or causing an effect of poison <poisonous mushrooms>


Medical Dictionary

poisonous

play
adjective poi·son·ous \ˈpȯiz-nəs, -ən-əs\

Medical Definition of poisonous

  1. 1:  having the properties or effects of poison <poisonous gas>

  2. 2:  producing a toxic substance that causes injury or death when absorbed or ingested <poisonous frogs and plants>; also :  venomous



Seen and Heard

What made you want to look up poisonous? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

an alert or lookout

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • alphabet-magnets
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ