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
After Albert Einstein.(American Heritage® Dictionary of the English Language, Fourth Edition)
Einstein + -ium. Named for Albert Einstein. (Wiktionary)