Es

n.

1.

the chemical symbol for einsteinium, a transuranic element with atomic number 99. The atomic weight of the longest-lived isotope, with a half-life of 276 days, is 254. The first isotope discovered, having atomic weight 253 and a half-life of 20 days, was recognized in 1952 in the debris from a hydrogen bomb test. As much as 3 micrograms of einsteinium were produced by a complex process involving long irradiation of plutonium isotopes in nuclear reactors. Its chemical properties are those of a trivalent actinide element.

Noun

1.

Es - a radioactive transuranic element produced by bombarding plutonium with neutrons Synonyms: atomic number 99, einsteinium, E

1.	(networking)	es - The country code for Spain.
2.	(operating system)	es - Extensible Shell.
3.		es - (Expert System) An expert system for the IBM PC featuring forward chaining, backward chaining and fuzzy set relations. ftp://ftp.uu.net/pub/ai/expert-sys/summers.tar.Z. [BYTE Oct 1990].

Extra Segment [register] (CPU, Intel, assembler)atomic number 99, E, einsteinium, metal, metallic element