ROENTGENIUM

roentgenium, Rg, element, atomic number

(noun) a radioactive transuranic element

Source: WordNet® 3.1


Etymology

Noun

roentgenium (uncountable)

A transuranic chemical element (symbol Rg) with atomic number 111.

Synonyms

• eka-gold (used before the element was discovered)

• unununium (used before the element was officially named)

Source: Wiktionary



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