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Definition of URANINITE - 3 dictionary results

u⋅ran⋅i⋅nite

  [yoo-ran-uh-nahyt, -rey-nuh-]
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–noun
a mineral, probably originally uranium dioxide, UO2, but altered by radioactive decay, and usually containing uranium trioxide, lead, radium, and helium, occurring in several varieties, including pitchblende: the most important ore of uranium.
Origin:
1875–80; uran(ium) + -in 2 + -ite 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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u·ra·ni·nite   (yŏŏ-rā'nə-nīt')   
n.  A complex brownish-black mineral, UO2, forming the chief ore of uranium and containing variable amounts of radium, lead, thorium, and other elements. It is isomorphous with thorianite.

[German Uranin (from New Latin ūranium, uranium; see uranium) + -ite1.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: ura·ni·nite
Pronunciation: yu-'rA-n&-"nIt
Function: noun
: a mineral that is basically a black octahedral or cubic oxide ofuranium containing lead, thorium, and rare earth elements and that is the chief ore of uranium
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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