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einsteinium

(īn stīn′ē əm)

☆

noun

a radioactive, metallic chemical element, one of the actinides, discovered in the debris of the first thermonuclear explosion in 1952, but now produced by bombarding plutonium with neutrons: symbol, Es; at. no., 99

Origin: ModL, after Albert Einstein (in honor of his theoretical studies of mass and energy) + -ium: so named (1955) by A. Ghiorso and co-workers, who identified it

See einsteinium in American Heritage Dictionary 4

noun Symbol Es

A synthetic transuranic element first produced by neutron irradiation of uranium in a thermonuclear explosion and now usually produced in the laboratory by irradiating plutonium and other elements. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C. See Table at element.

Origin:

Origin: After Albert Einstein

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