Definition of thorium in English:

Share this entry

thorium

Pronunciation: /ˈTHôrēəm/

noun

The chemical element of atomic number 90, a white radioactive metal of the actinide series. (Symbol: Th)
Example sentences
  • In addition to primeval heat, Earth's core also gets heat from radioactive decay of uranium, thorium, and potassium.
  • All natural rocks contain small amounts of uranium and thorium, which are radioactive and remain so for billions of years.
  • The analysis shows that manganese, titanium, hafnium, thorium, phosphorus, and the rare-earth elements play a significant role in discriminating between zircons of various origins.

Origin

Mid 19th century: named after the god Thor.

For editors and proofreaders

Syllabification: tho·ri·um

Share this entry
 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.