American Heritage® Dictionary of the English Language, Fourth Edition
- n. A whitish, largely inert gaseous element used chiefly in gas discharge lamps and fluorescent lamps. Atomic number 36; atomic weight 83.80; melting point -156.6°C; boiling point -152.30°C; density 3.73 grams per liter (0°C). See Table at element.
Century Dictionary and Cyclopedia
- n. A chemical element, one of the five recently discovered gaseous constituents of the atmosphere, first obtained by Ramsay and Travers in 1898. It is colorless, transparent, without observable taste or smell, of density 40.88 as compared with hydrogen, liquefiable at—151.7° C. under atmospheric pressure, and occurs in the atmosphere to the extent of but 1 volume in 20,000,000 volumes of air.
GNU Webster's 1913
- n. (Chem.) An inert gaseous element of the argon (noble gas) group, of atomic number 36, occurring in air to the extent of about one volume in a million. It was discovered by Ramsay and Travers in 1898. Boiling point, -152.3° C.; melting point, -156.6° C.; symbol, Kr; atomic weight, 83.8.
- n. a colorless element that is one of the six inert gasses; occurs in trace amounts in air
- Neuter form of Ancient Greek κρυπτός ("hidden"). (Wiktionary)
- Greek krupton, neuter of kruptos, hidden (from its rarity), from kruptein, to hide. (American Heritage® Dictionary of the English Language, Fourth Edition)
“He's included chairs with a germ-resistant fabric called krypton (ph) and a seating area for families.”
“Although the density of the new gas, which we named "krypton" or”
“Fluorine can react with noble gases such as krypton and xenon.”
“Later, in 1898 he also discovered, by fractional distillation of liquid air, neon ( "the new one"), krypton ( "the hidden one") and xenon ( "the strange one").”
“First, a range of less-dangerous gases are liberated, including tritium, krypton and xenon.”
“According to Arnie Gunderson, a former U.S. nuclear power plant operator: events over the last day indicate that volatile radioactive elements such as xenon, krypton, cesium, iodine, and strontium are already being released from the Fufushima nuclear reactor.”
“In a total meltdown, several radioactive gases are released on the less-toxic end of the spectrum, including nitrogen-16, tritium and krypton.”
“Many also use double or triple-panes with argon or krypton gas sandwiched in between, which helps insulate in cold climates.”
“The noble gases (helium, neon, argon, krypton, xenon, and radon) possess full octets, which they guard closely (notice their high ionization energies and small atomic radii), and tend not to interact with other atoms.”
“High-intensity krypton lights were ready to work at Tempelhof and, at the same time, full-time airlift service began at Tegel, even though some flights came dangerously close to two radio towers—393 and 262 feet high—near the end of the approach runway.”
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