PLUTONIUM

plutonium, Pu, atomic number

(noun) a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239

Source: WordNet® 3.1

Etymology

Noun

plutonium (usually uncountable, plural plutoniums)

The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray radioactive actinide metal that tarnishes when exposed to air.

(countable, historical) Alternative form of ploutonion

Source: Wiktionary

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