ionopause

American

[ahy-on-uh-pawz] / aɪˈɒn əˌpɔz /

noun

the transitional zone between the ionosphere and the mesosphere.

ionopause British

/ aɪˈɒnəˌpɔːz /

noun

the transitional zone in the atmosphere between the ionosphere and the exosphere, about 644 km (400 miles) from the earth's surface

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of ionopause

iono- + pause

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023