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The Collaborative International Dictionary of English v.0.48 (gcide)

curium \curium\ n. [after Pierre and Marie Curie.]
a radioactive transuranic element of atomic number 96, having
an atomic weight of 247 for its most stable isotope
(half-life 1.6 x 10^{7} years). The chemical symbol is Cm.

Note: It was first prepared in 1944 by helium-ion bombardment
of plutonium in a cyclotron by Glenn Seaborg and
colleagues in California. It has never been detected in
nature, though minute quantities may exist in uranium
deposits as a consequence of the neutron flux there.

Syn: Cm, atomic number 96.
[WordNet 1.5]