Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
A layer of ionized gas occurring between roughly 90–150 km (56–93 mi) above the ground. It reflects medium-frequency radio waves, and thus enables them to be propagated beyond the horizon.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: Heaviside layer, E layer, E region
Antonyms: none provided
Broader terms: region, part
History
Named after Arthur E. Kennelly and Oliver Heaviside.
