Etymology
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einsteinium (n.)

radioactive element, discovered in the debris of a 1952 U.S. nuclear test in the Pacific, named 1955 for physicist Albert Einstein (1879-1955). With metallic element ending -ium.

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Definitions of einsteinium

einsteinium (n.)
a radioactive transuranic element produced by bombarding plutonium with neutrons;
Synonyms: Es / e / atomic number "
From wordnet.princeton.edu