Einsteinium Definition

īn-stīnē-əm
noun
A radioactive, metallic chemical element, one of the actinides, discovered in the debris of the first thermonuclear explosion in 1952, but now produced by bombarding plutonium with neutrons: symbol, Es; at. no. 99
Webster's New World
Synonyms:
  • e
  • atomic number 99
  • es

Origin of Einsteinium

  • Einstein +‎ -ium. Named for Albert Einstein.

    From Wiktionary

  • After Albert Einstein

    From American Heritage Dictionary of the English Language, 5th Edition

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einsteinium