You searched for: “atmospheric shell
atmospheric layer, atmospheric shell, atmospheric region
1. Any one of a number of layers of the atmosphere, most commonly distinguished by temperature distribution.
2. One of several strata or layers of the earth's atmosphere.

Temperature distribution is the most common criterion used for denoting the various shells.

This entry is located in the following units: atmo-, atm- + (page 4) sphero-, spher-, -sphere- + (page 3)