ionosphere
io·nosp·here
noun
1.
the outer region of the Earth''s atmosphere; contains a high concentration of free electrons
Origin
From iono- + -sphere.
Related words
Broader terms
Parts
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.