Definitions from Wiktionary (Krypton)

▸ noun:  (uncountable) 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.
▸ noun:  (countable) An atom of this element.
▸ noun:  (fiction, DC Comics fictional milieu) A fictional planet, the native world of Superman, named after the element krypton.
▸ Also see krypton

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