(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere WordNet 3.0 & Open English WordNet

A meteoroid is a small rocky or metallic body in outer space. Wikipedia

Small rocky or metallic body travelling through outer space. Wikipedia Disambiguation

A small sand to boulder-sized particle of debris in the Solar system. Wikipedia Disambiguation

Sand- to boulder-sized particle of debris in the Solar System Wikidata

Any atmospheric phenomenon. (Thus the derivation of meteorology.) These were sometimes classified as aerial or airy meteors (winds), aqueous or watery meteors (hydrometeors: clouds, rain, snow, hail, dew, frost), luminous meteors (rainbows and aurora), and igneous or fiery meteors (lightning and shooting stars). Wiktionary

A relatively small (sand- to boulder-sized) fragment of debris in a star system that produces a meteor when it hits the atmosphere. Wiktionary

Small debris in a star system. Wiktionary (translation)