E layer

n.
A region of the ionosphere, extending from about 90 to 150 kilometers (55 to 95 miles) above the earth and influencing long-distance communications by strongly reflecting radio waves in the range from one to three megahertz. Also called E region, Heaviside layer, Also called Kennelly-Heaviside layer.

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The noun has one meaning:

Meaning #1: a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
  Synonyms: Heaviside layer, Kennelly-Heaviside layer, E region

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