A meteoroid was a piece of astronomical debris, smaller than an asteroid. When a meteoroid entered an atmosphere, it was called a meteor, also colloquially known as a shooting star or falling star, and the remains found after it landed were called meteorites. Really small meteorites were classified as micrometeoroids. (VOY: "Year of Hell, Part II")
A.E. Hodgkin theorized that the termites of Loracus Prime were meteorite-borne before developing Hodgkin's Law of Parallel Planetary Development. (ENT: "Strange New World")
Earth Cargo Service freighters used any chance to upgrade their weapons. When asked by Captain Jonathan Archer why this was, Travis Mayweather replied "Think about it. You're a dozen light years from home with twenty kilotons of dilithium ore in your hold, armed with nothing but a pop-gun for shooting oncoming meteors. What would you do?" (ENT: "Fortunate Son")
In 2254, as the USS Enterprise was deflecting meteoroids, the starship detected something heading in the direction of the ship. José Tyler thought it could be the meteoroids; Una Chin-Riley disagreed, saying it was not the meteoroids. Tyler further noted that whatever it was, the ship's meteoroid beam was not deflecting it. (TOS: "The Cage", "The Menagerie, Part I")
The probe Nomad suffered a serious loss of memory after a collision with a meteoroid. (TOS: "The Changeling")
In 2262, the SS Beagle suffered serious damage from a storm of meteoroids. (TOS: "Bread and Circuses")
In 2268, Sulu informed Captain Kirk of a meteor impact on Earth in the region of Siberia whose impact flattened the forest for several kilometers. Kirk dismissed the comment, stating that if he wanted a Russian history lesson, he would have brought Chekov. (TOS: "That Which Survives")