superoxide

noun su·per·ox·ide \ ˌsü-pər-ˈäk-ˌsīd \

Definition of superoxide

: the monovalent anion O2 or a compound containing it
  • potassium superoxide KO2

First Known Use of superoxide

1807

in the meaning defined above

See Words from the same year
NEW! Time Traveler

Medical Dictionary

superoxide

noun su·per·ox·ide \ -ˈäk-ˌsīd \

medical Definition of superoxide

: any of various toxic oxygen-containing free radicals; especially : the monovalent anion O2 or a compound containing it
  • potassium superoxide KO2

Learn More about superoxide


Seen and Heard

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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

widely and unfavorably known

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a-closeup-of-a-sunflower
  • Which of the following words means “of or relating to summer”?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

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

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!