the stratosphere - definition and synonyms

noun 

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/ˈstrætəˌsfɪə(r)/
  1. 1
    the part of the Earth’s atmosphere that is 10 km to 50 km above the surface
  2. 2
    mainly journalism a very high level

derived word

stratospheric

 

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/ˌstrætəˈsferɪk/
adjective