noun
Usage: usually capitalized E
: the part of the ionosphere occurring between 40 and 90 miles above the surface of the earth and containing the daytime E layer and the sporadic E layer
noun
Usage: usually capitalized E
: the part of the ionosphere occurring between 40 and 90 miles above the surface of the earth and containing the daytime E layer and the sporadic E layer
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012