kryp·ton 
(krĭptŏn′)
(krĭptŏn′)n. Symbol Kr
A colorless, largely inert gaseous element used chiefly in gas discharge lamps and fluorescent lamps. Atomic number 36; atomic weight 83.80; melting point -157.36°C; boiling point -153.34°C; density 3.733 grams per liter (0°C). See Periodic Table.
[Greek krupton, neuter of kruptos, hidden (from its rarity), from kruptein, to hide.]
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