Etymology
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meteoroid (n.)

"rock or metallic mass floating in space," which becomes a meteor when it enters Earth's atmosphere and a meteorite when it strikes, 1865, formed in English from meteor + -oid.

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Definitions of meteoroid

meteoroid (n.)
(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere;
Synonyms: meteor
From wordnet.princeton.edu