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einsteinium

American  
[ahyn-stahy-nee-uhm] / aɪnˈstaɪ ni əm /

noun

Chemistry, Physics.

  1. a transuranic element. Es; 99.

einsteinium British  
/ aɪnˈstaɪnɪəm /

noun

  1. a metallic transuranic element artificially produced from plutonium. Symbol: Es; atomic no: 99; half-life of most stable isotope, 252 Es: 276 days

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
einsteinium Scientific  
/ īn-stī′nē-əm /

  1. A synthetic, radioactive metallic element of the actinide series that is usually produced by bombarding plutonium or another element with neutrons. It was first isolated in a region near the explosion site of a hydrogen bomb. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C.

  2. See Periodic Table

Etymology

Origin of einsteinium

1950–55; named after Albert Einstein; see -ium

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.