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; atomic number: 96.

1946; < Neo-Latin; named after M. and P. Curie; see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
curium (ˈkjʊərɪəm)
a silvery-white metallic transuranic element artificially produced from plutonium. Symbol: Cm; atomic no: 96; half-life of most stable isotope, 247Cm: 1.6 x 107 years; valency: 3 and 4; relative density: 13.51 (calculated); melting pt: 1345±400°C
[C20: New Latin, named after Pierre and Marie Curie]

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Medical Dictionary

curium cu·ri·um (kyur'ē-əm)
Symbol Cm
A metallic synthetic radioactive transuranic element. Atomic number 96; longest-lived isotope Cm 247; melting point (estimated) 1,350°C; valence 3,4.

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American Heritage
Science Dictionary
curium   (kyr'ē-əm)  Pronunciation Key 
Symbol Cm
A synthetic, silvery-white, radioactive metallic element of the actinide series that is produced artificially from plutonium or americium. Curium isotopes are used to provide electricity for satellites and space probes. Its most stable isotope has a half-life of 16.4 million years. Atomic number 96; melting point (estimated) 1,350°C; valence 3. See Periodic Table.
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Encyclopedia Britannica


synthetic chemical element of the actinoid series of the periodic table, atomic number 96. Undetected in nature, curium (as the isotope curium-242) was discovered (summer 1944) at the University of Chicago by Glenn T. Seaborg, Ralph A. James, and Albert Ghiorso in a plutonium isotope, plutonium-239, that had been bombarded by helium ions (alpha particles) in the 60-inch cyclotron at the University of California, Berkeley. It was the third transuranium element to be discovered

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Example sentences
Previous studies also indicate that the heavy actinide element curium belongs in this category.
In these cases, high gamma-ray background rates or interference by neutrons from plutonium or curium make a shuffler necessary.
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