thorianite Hear it!

thorianite definition

tho·ria·nite (-nīt′)

noun

a grayish-to-black, very hard, radioactive mineral, thorium dioxide, ThO, that is an ore of thorium

Etymology: < thoria + -ite

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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