e region

English Thesaurus

1. a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length (noun.location)

instance hypernym	:	part, region,
definition	:	the extended spatial location of something (noun.location)

part meronym	:	ionosphere,
definition	:	the outer region of the Earth's atmosphere; contains a high concentration of free electrons (noun.location)