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heaviside layer is a noun meaning "a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length". It carries one recorded sense.
a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
Definitions, synonyms and semantic relations for heaviside layer come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.