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Vinony

tropopause

noun

  1. upper boundary of troposphere
L329648 on Wikidata ↗

Wiktionary

noun

Etymology: From tropo- (“troposphere”) + -pause (“discontinuance”).

  1. The zone of transition between the troposphere and the stratosphere (approximately 13 kilometers). The tropopause normally occurs at an altitude of between 25,000 and 45,000 feet in polar and temperate zones. It occurs at 55,000 feet in the tropics.