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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
d-layer is a noun meaning "the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves". It carries one recorded sense.
the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
Definitions, synonyms and semantic relations for d-layer come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.