Mesosphere (noun)

The layer of the earth's atmosphere that lies above the stratosphere and below the thermosphere, characterized by decreasing temperatures with increasing altitude.

Origin:

Mid 19th century: from meso- "middle" + sphere.

Examples:

1. Meteoroids burn up upon entering the mesosphere.
2. The mesosphere is the home to meteors and shooting stars.
3. The mesosphere is a crucial layer of the Earth's atmosphere.
4. Spacecraft must travel through the mesosphere to reach the thermosphere.
5. The mesosphere acts as a barrier to protect the Earth from harmful radiation.