tropopause

English Thesaurus

1. the region of discontinuity between the troposphere and the stratosphere (noun.object)

hypernym	:	layer,
definition	:	a relatively thin sheetlike expanse or region lying over or under another (noun.location)

part meronym	:	troposphere,
definition	:	the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude) (noun.object)