ein·stei·ni·um
(īn-stī′nē-əm)n. Symbol Es
A synthetic transuranic element first produced by neutron irradiation of uranium in a thermonuclear explosion and now usually produced in the laboratory by irradiating plutonium and other elements. The isotopes with the longest half-lives are Es-252 (472 days) and Es-254 (276 days). Atomic number 99; melting point 860°C (estimated); valence 2, 3. See Periodic Table.
[After Albert Einstein.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
einsteinium
(aɪnˈstaɪnɪəm)n
(Elements & Compounds) a metallic transuranic element artificially produced from plutonium. Symbol: Es; atomic no: 99; half-life of most stable isotope, 252Es: 276 days
[C20: New Latin, named after Albert Einstein]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ein•stein•i•um
(aɪnˈstaɪ ni əm)n.
a transuranic element. Symbol: Es; at. no.: 99.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ein·stein·i·um
(īn-stī′nē-əm) Symbol Es A synthetic, radioactive metallic element of the actinide series that is usually produced by bombarding plutonium or another element with neutrons. The most stable isotope of einsteinium has a half-life of 1.3 years. Atomic number 99. See Periodic Table.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
| Noun | 1. |  einsteinium - a radioactive transuranic element produced by bombarding plutonium with neutronsmetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
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