from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A colorless, odorless, highly unreactive gaseous element found in minute quantities in the atmosphere, extracted commercially from liquefied air and used in stroboscopic, bactericidal, and laser-pumping lamps. Atomic number 54; atomic weight 131.29; melting point -111.9°C; boiling point -107.1°C; density (gas) 5.887 grams per liter; specific gravity (liquid) 3.52 (-109°C). See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A heavy, gaseous chemical element (symbol Xe) of the noble gases group with an atomic number of 54.
from the GNU version of the Collaborative International Dictionary of English
- n. A very heavy, inert gaseous element of the noble gas group, occurring in the atmosphere in the proportion of one volume is about 20 millions. It was discovered by Ramsay and Travers in 1898. It can be condensed to a liquid boiling at -107° C., and to a solid which melts at -111.9° C. Symbol Xe (formely also X); atomic number 54; atomic weight 131.3.
from The Century Dictionary and Cyclopedia
- n. In chem., the heaviest of the five recently discovered elementary substances present in gaseous form in the atmosphere.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
From Greek, neuter of xenos, foreign, strange; see xeno-.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ξένον, neuter of ξένος (xenos, "foreign, strange"). (Wiktionary)