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tropicbird
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tropology
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troposphere
tro·po·sphere [ trṓpə sfr, tróppə sfr ]


noun 
Definition:
 
lowest layer of atmosphere: the lowest and most dense layer of the atmosphere, extending 10 to 20 km (6 to 12 mi), in which temperature decreases with rising altitude and most weather occurs

tro·po·spher·ic [ trpə sfrik, trppə sférrik, tròppə sférrik ] adjective
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