meteoroid
meteoroid Small, extraterrestrial body, within the solar system, that may enter the Earth's atmosphere if its orbit around the Sun crosses that of the Earth. Strictly, at the point where a meteoroid enters the atmosphere it is referred to as a meteor; if it reaches the Earth's surface it is known as a meteorite.
meteoroid
me·te·or·oid / ˈmētēəˌroid/ • n. Astron. a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.DERIVATIVES: me·te·o·roid·al / ˌmētēəˈroidl/ adj.
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