Etymology
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troposphere (n.)

1914, from French troposphère, literally "sphere of change," coined by French meteorologist Philippe Teisserenc de Bort (1855-1913) from Greek tropos "a turn, change" (from PIE root *trep- "to turn") + sphaira "sphere" (see sphere). Related: Tropopause.

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Definitions of troposphere

troposphere (n.)
the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude);
From wordnet.princeton.edu