promethium

noun
pro·​me·​thi·​um | \ prə-ˈmē-thē-əm How to pronounce promethium (audio) \

Definition of promethium

: a radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium — see Chemical Elements Table

First Known Use of promethium

1948, in the meaning defined above

History and Etymology for promethium

New Latin, from Latin Prometheus

Keep scrolling for more

Learn More about promethium

Share promethium

Statistics for promethium

Look-up Popularity

Time Traveler for promethium

The first known use of promethium was in 1948

See more words from the same year

Keep scrolling for more

More Definitions for promethium

promethium

noun
pro·​me·​thi·​um | \ prə-ˈmē-thē-əm How to pronounce promethium (audio) \

Medical Definition of promethium

: a radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium symbol Pm — see Chemical Elements Table

More from Merriam-Webster on promethium

Britannica.com: Encyclopedia article about promethium

Comments on promethium

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

WORD OF THE DAY

to reflect, repel, echo, or resound

Get Word of the Day daily email!

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt-painting-a-young-scholar-and-his-tutor
  • Which of the following is the earliest known sense of the word awe?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Syn City

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!