Thermosphere

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere.

    "The mesosphere may be described as the earth's intermediate or middle atmosphere, which separates the thermosphere above from the ozonosphere (or stratosphere) below, both of which are responsible for absorption of most of the ultraviolet part of the solar radiation and preventing it from reaching the earth's surface."

  2. 2
    the atmospheric layer between the mesosphere and the exosphere wordnet

Example

More examples

"Within the thermosphere, temperatures rise continually to well beyond 1,000 degrees C."

Etymology

From thermo- + -sphere.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.