actinon

noun
ac·​ti·​non | \ ˈak-tə-ˌnän How to pronounce actinon (audio) \

Medical Definition of actinon

: a gaseous radioactive isotope of radon that has a half-life of about four seconds

Comments on actinon

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

WORD OF THE DAY

to form ideas or theories about something

Get Word of the Day daily email!

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

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!