Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

1

poison

play
noun poi·son \ˈpȯiz-ən\

Medical Definition of poison

  1. 1:  a substance that through its chemical action usually kills, injures, or impairs an organism

  2. 2:  a substance that inhibits the activity of another substance or the course of a reaction or process <a catalyst poison>




2

poison

transitive verb poi·son

Medical Definition of poison

poisoned; poisoning \ˈpȯiz-niŋ, -ən-iŋ\play

  1. 1:  to injure or kill with poison

  2. 2:  to treat, taint, or impregnate with poison




3

poison

adjective poi·son

Medical Definition of poison

  1. 1:  poisonous <a poison plant>

  2. 2:  impregnated with poison <a poison arrow>





Seen and Heard

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

WORD OF THE DAY

to eat gluttonously or ravenously

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1926873504

Which of the following best describes an easily irritated person?

superficial flashy gregarious tetchy
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