# mesosphere

> English word · Noun

## Definitions
1. The layer of the Earth's atmosphere that is directly above the stratosphere and directly below the thermosphere.
2. The lower mantle, a layer inside the Earth.

## Etymology
From meso- + -sphere.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mesosphere