hesperium

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English

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English Wikipedia has an article on:
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Alternative forms

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Etymology

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From Italian Esperio after a Greek name of Italy + -ium, Ancient Greek Ἑσπερία (Hespería, “land of the west”).

Noun

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hesperium (uncountable)

  1. (obsolete) A rejected name for plutonium. (Esperium chemical symbol: Es)
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