Library / English Dictionary

    D REGION

    Pronunciation (US): Play  (GB): Play

     I. (noun) 

    Sense 1

    Meaning:

    The lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio wavesplay

    Synonyms:

    D-layer; D region

    Classified under:

    Nouns denoting spatial position

    Instance hypernyms:

    part; region (the extended spatial location of something)

    Holonyms ("D region" is a part of...):

    ionosphere (the outer region of the Earth's atmosphere; contains a high concentration of free electrons)

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