Definition of middle zone in US English:

middle zone

noun

  • 1Poetic= "torrid zone".

  • 2In handwriting: the linear area whose height and position is defined by that of lower-case letters without ascenders or descenders; the area corresponding to the x-height.

Origin

Mid 16th century; earliest use found in Arthur Golding (d. 1606), translator. From middle + zone.

Pronunciation

middle zone

/ˈmɪdl ˌzəʊn/