meteoritePronunciation: /ˈmiːtɪərʌɪt/Translate meteorite | into French | into Italian | into Spanish Definition of meteorite noun a piece of rock or metal that has fallen to the earth’s surface from outer space as a meteor. Over 90 per cent of meteorites are of rock while the remainder consist wholly or partly of iron and nickel. Derivatives meteoriticPronunciation: /-ˈrɪtɪk/ adjective meteorite in other Oxford dictionaries Definition of meteorite in the US English dictionary