hesperium

H4E1S1P3E1R1I1U1M3

noun

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

OriginItalian Esperio ← Ancient Greek Ἑσπερία →
Scrabble 16
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Meanings

nounhesperium (uncountable)

alternative esperium

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

Origin

  1. Ancient GreekἙσπερία“land of the west”
  2. ItalianEsperio
  3. Englishhesperium

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

More words from Italian, Ancient Greek

Full word history & related roots →
Cite this entry
APA

hesperium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/hesperium

MLA

“hesperium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/hesperium. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “hesperium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/hesperium.

Source: hesperium on Wiktionary, CC BY-SA 4.0.