a colorless element that is one of the six inert gasses; occurs in trace amounts in air
The chemical element (symbol Kr) with an atomic number of 36. It is a colourless, odourless noble gas that only reacts with fluorine. It is one of the rarest gases in the Earth's atmosphere.
A fictional planet, the native world of Superman, named after the element krypton.
The name krypton comes from the Ancient Greek word kryptos, meaning "hidden." The suffix -on was added to follow the naming pattern used for other noble gases.