meteoroid

n. small solid body which becomes a meteor upon entrance to the Earth's atmosphere (Astronomy)

A meteoroid is a small sand to boulder-sized particle of debris in the Solar system. The visible path of a meteoroid that enters Earth's (or another body's) atmosphere is a meteor, commonly called a "shooting star" or "falling star". Many meteors are part of a meteor shower.
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Noun
1. (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere
(synonym) meteor
(hypernym) extraterrestrial object, estraterrestrial body
(hyponym) meteorite
(classification) astronomy, uranology

(n.)
A small body moving through space, or revolving about the sun, which on entering the earth's atmosphere would be deflagrated and appear as a meteor.
  

METEOROIDE