/mez"euh pawz', mes"-, mee"zeuh-, -seuh-/ , n. Meteorol.
1. the boundary or transition zone between the mesosphere and the ionosphere. Cf. mesosphere (def. 1).
2. the top of the mesosphere, determined by the appearance of a temperature minimum near an altitude of 50 mi. (80 km). Cf. mesosphere (def. 2).
[ 1945-50; MESO- + PAUSE ]