Einsteinium

//aɪnˈstaɪni.əm// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A transuranic chemical element (symbol Es) with atomic number 99: a soft, silvery, paramagnetic metal. uncountable

    "Einsteinium, the 99th element of the periodic table, was discovered in the fallout of the first hydrogen bomb, detonated by the United States in the Marshall Islands on November 1, 1952."

  2. 2
    a radioactive transuranic element produced by bombarding plutonium with neutrons wordnet

Synonyms

All synonyms
atomic number 99eelementesradioelementradium

Example

More examples

"Einsteinium is the name for the element with atomic number 99 and is represented by the symbol Es. It is a member of the actinide group."

Etymology

From Einstein + -ium. Named after Albert Einstein.

Related phrases

atomic number

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.