strat·o·pause (strāt'ə-pôz') n. The boundary between the stratosphere and the mesosphere located at an altitude of about 55 kilometers (35 miles) above the earth's surface.
stratopause (strāt'ə-pôz') Pronunciation Key
The boundary between the stratosphere and the mesosphere, located at an altitude of about 50 km (31 mi) above the Earth's surface.