ACTINIUM

actinium, Ac, atomic number

(noun) a radioactive element of the actinide series; found in uranium ores

Source: WordNet® 3.1

Etymology

Noun

actinium (uncountable)

a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores

Source: Wiktionary

Ac*tin"i*um, n. Etym: [Gr. (Chem.)

Definition: A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light.

Source: Webster’s Unabridged Dictionary 1913 Edition

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