mesosphere.

1. The atmospheric layer above the stratosphere and below the thermosphere, where temperature generally decreases with height.

2. In some geophysical terminology, the comparatively strong mantle region beneath the asthenosphere.

Use it for

Words that belong together

• Earth’s mesosphere
• the upper mesosphere
• mesospheric clouds

On the page

The probe crossed the mesosphere before the heating profile changed again.

Clouds near the upper mesosphere glowed after the lower sky had gone dark.

Usage notes

Primary category: sci-fi. Forms: Singular mesosphere; plural mesospheres. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.