Did you know?

Click any word in a definition or example to find the entry for that word

thorium - definition and synonyms

Close

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Close

ThesaurusThesaurus

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

more
noun [uncountable] chemistry     thorium pronunciation in British English
/ˈθɔːriəm/
  1. From our crowdsourced Open Dictionary
    2
    a radioactive element, which some countries are planning to use as a source of nuclear power because it is considered to be safer than uranium

    Officials are currently selecting a site for the reactor, which would be the first of its kind, using thorium for the bulk of its fuel instead of uranium – the fuel for conventional reactors.

    Submitted from United Kingdom on 02/11/2011
BuzzWord

Physical Cookie

a small electronic device which is taken into shops and links individual customers to advertisements …

BuzzWord Article

Open Dictionary

sortilege

the act or practice of telling the future using random items such as playing cards

add a word

Blog

A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play