Home › Words › H › hesperiumhesperiumhesperium means A rejected name for plutonium. (Esperium chemical symbol: Es).EtymologyFrom Italian Esperio after a Greek name of Italy + -ium, Ancient Greek Ἑσπερία (Hespería, “land of the west”).nounA rejected name for plutonium. (Esperium chemical symbol: Es)Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.athenium 62% match — A rejected name for einsteinium. vs hesperium →ausonium 61% match — A rejected name for neptunium. (Ausonium chemical symbol: Ao) vs hesperium →jargonium 61% match — A rejected name for hafnium. vs hesperium →prometheum 60% match — A rejected name for the chemical element promethium. vs hesperium →berzelium 59% match — A rejected name for praseodymium. vs hesperium →centurium 58% match — A rejected name for fermium. vs hesperium →alabamium 56% match — A rejected name for astatine. vs hesperium →cyclonium 55% match — A rejected name for the chemical element promethium. vs hesperium →