-sphere

a combining form of sphere (planisphere); having a special use in the names of the layers of gases and the like surrounding the earth and other celestial bodies (ionosphere).

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World English Dictionary

-sphere

—*n combining form*
1.	having the shape or form of a sphere: bathysphere
2.	indicating a spherelike enveloping mass: atmosphere

-spheric

—*adj combining form*

Collins English Dictionary - Complete & Unabridged 10th Edition
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