IPA: //ˌθɜːrməˈsfɛrɪk//
KK: /ˈθɜrməˌsfɛrɪk/
Relating to the thermosphere, which is a layer of the Earth's atmosphere located above the mesosphere and characterized by high temperatures and low density.
The thermospheric region of the atmosphere is crucial for satellite communication.
Thermospheric → It is formed from "thermo-" (from Greek "thermos", meaning heat) and "spheric" (from Greek "sphaira", meaning sphere). The word "thermospheric" refers to the layer of the Earth's atmosphere that is characterized by high temperatures, thus relating to heat in a spherical layer of the atmosphere.
Think of 'heat' ('thermo-') in a 'sphere' ('spheric') — that's why thermospheric refers to the heated layer of the atmosphere.