Dictionary![]() ![]() cu•ri•umPronunciation: (kyoor'ē-um), [key] —n. a radioactive element not found in nature but discovered in 1944 among the products of plutonium after bombardment by high-energy helium ions. Symbol: Cm; at. no.: 96. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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