uranium trioxide(redirected from O3u)
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A poisonous radioactive orange polymorphic solid, UO3, used for uranium refining and as a coloring agent in ceramics.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.