IPA: /ˌstrætəˈsfɛrɪk/
KK: /strætəˈsfɛrɪk/
Relating to the layer of the Earth's atmosphere above the troposphere, where the air is stable and the temperature increases with altitude.
The stratospheric ozone layer protects us from harmful ultraviolet radiation.
Stratospheric → It is formed from "stratum" (from Latin, meaning layer) and "sphericus" (from Greek "sphairikos", meaning spherical). The word "stratospheric" refers to something related to the stratosphere, which is a layer of the atmosphere.
Think of the word 'stratum' meaning layer, and 'sphericus' meaning spherical, to remember that 'stratospheric' relates to the layer of the atmosphere that is spherical.