stratosphere
Concise Oxford English Dictionary © 2008 Oxford University Press:
stratosphere /ˈstratəˌsfɪə/
▶noun
- 1 the layer of the earth's atmosphere above the troposphere, extending to about 50 km above the earth's surface (the lower boundary of the mesosphere).
- 2 informal the very highest levels of something: the fashion stratosphere.
– derivatives
stratospheric /-ˈsfɛrɪk/ adjective,
stratospherically adverb.
stratospheric /-ˈsfɛrɪk/ adjective,
stratospherically adverb.
'stratosphere' also found in these Oxford entries:

