Meteoroid, Meteor & Meteorite

Meteoroid, Meteor & Meteorite

A meteoroid is a small rocky or metallic body travelling through space. Meteoroids are significantly smaller than asteroids, and range in size from small grains to 1 meter-wide objects. Most are fragments from comets or asteroids, while others are collision impact debris ejected from bodies such as the Moon or Mars.

A meteor or "shooting star" is the visible streak of light from a meteoroid or micrometeoroid, heated and glowing from entering the Earth's atmosphere, as it sheds glowing material in its wake. Meteors typically occur in the mesosphere at altitudes between 76 km to 100 km (46–62 miles).

A meteorite is a solid piece of debris, from such sources as asteroids or comets, that originates in outer space and survives its impact with the Earth's surface. 

References:
http://thedarkcosmos.com/meteors/
http://en.wikipedia.org/wiki/Meteorite
Animated illustration of different phases as a meteoroid enters the Earth’s atmosphere to become visible as a meteor and land as a meteorite.