What is the meaning of Meteoroid?

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

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

meteor, falling star, shooting star (fast-moving streak of light in the night sky caused by the entry of extraterrestrial matter into the earth's atmosphere; a shooting star or falling star)

Source: wiktionary.org