astatine

noun

as·​ta·​tine ˈa-stə-ˌtēn How to pronounce astatine (audio)
: a radioactive halogen element discovered by bombarding bismuth with alpha particles and also formed by radioactive decay see Chemical Elements Table

Word History

Etymology

Greek astatos unsteady, from a- + statos standing, from histanai to cause to stand — more at stand

First Known Use

1947, in the meaning defined above

Time Traveler
The first known use of astatine was in 1947

Dictionary Entries Near astatine

Cite this Entry

“Astatine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/astatine. Accessed 27 Jan. 2023.

Kids Definition

astatine

noun
as·​ta·​tine ˈas-tə-ˌtēn How to pronounce astatine (audio)
: a radioactive element discovered by bombarding bismuth with helium nuclei see element

Medical Definition

astatine

noun
as·​ta·​tine ˈas-tə-ˌtēn How to pronounce astatine (audio)
: a radioactive halogen element discovered by bombarding bismuth with helium nuclei and also formed by radioactive decay
symbol At

called also ekaiodine

see Chemical Elements Table

More from Merriam-Webster on astatine

Love words? Need even more definitions?

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


The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?

PLAY