Share this entry

Share this page

radium

Syllabification: ra·di·um
Pronunciation: /ˈrādēəm
 
/

Definition of radium in English:

noun

The chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series. It was formerly used as a source of radiation for radiotherapy. (Symbol: Ra)
Example sentences
  • Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium.
  • All isotopes of radium are radioactive with radium - 226 being the most stable.
  • The ability of radioactive substances such as radium to radiate energy, apparently spontaneously and continuously, appeared to contradict the law of the conservation of energy.

Origin

late 19th century: from Latin radius 'ray' + -ium.

Definition of radium in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day verbose
Pronunciation: vərˈbōs
adjective
using more words than are needed…