from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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. Its longest-lived isotope is Es 254 with a half-life of 276 days. Atomic number 99; melting point 860°C. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a transuranic chemical element (symbol Es) with atomic number 99.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a radioactive transuranic element produced by bombarding plutonium with neutrons
Don't expect much, after all these are the people behind elements like californium and einsteinium.
We are not including words coming from the names of particular people, like einsteinium, watt, curium, henry, and other eponyms: we refer here only to first names that have acquired meanings of their own or that, by association, have acquired special connotations.
I really hope that’s just slang and it has a real-sounding name because I’m just now getting used to einsteinium.