Definitions for "micrometeorite"
A meteorite so small that it drifts down to Earth without becoming intensely heated in the earth's atmosphere.
a particle from space that is small enough to be slowed down when it reaches the Earth's atmosphere without being burnt up. Approximately 50 micrometeorites per square meter hit the top of Earth's atmosphere each day.
a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere