the ionosphere
noun/ði aɪˈɒnəsfɪə(r)/
/ði aɪˈɑːnəsfɪr/
[singular]- a layer of the earth’s atmosphere between about 80 and 1 000 kilometres above the surface of the earth that reflects radio waves around the earth compare stratosphereTopics Spacec2
Want to learn more?
Find out which words work together and produce more natural sounding English with the Oxford Collocations Dictionary app.
Check pronunciation:
the ionosphere