English word ionosphere comes from English -sphere, English iono- (ISV combining form denoting relationship to ions.)
| Dictionary entry | Language | Definition |
|---|---|---|
| -sphere | English (eng) | (mathematics) Used to form nouns indicating a sphere of x dimensions. Designating some layer of the Earth. |
| iono- | English (eng) | ISV combining form denoting relationship to ions. |
| ionosphere | English (eng) | The part of the Earth's atmosphere beginning at an altitude of about 50 kilometers (31 miles) and extending outward 500 kilometers (310 miles) or more.. The similar region of the atmosphere of another planet. |