Troposphere

noun

Definitions

Noun
  1. 1
    The lower levels of the atmosphere extending from the surface of the Earth or another celestial body up to the tropopause. It is characterized by convective air movements and a large vertical temperature change.
  2. 2
    the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude) wordnet

Etymology

Borrowed from French troposphère. Equivalent to tropo- + -sphere.

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