/ Dictionary / Index C curium: Meaning and Definition of Find definitions for: cu•ri•um Pronunciation: (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. See also: curium (Thesaurus) Curitiba curl Related Content Daily Word Quiz: reiterate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language