d layer

d lay·er
D d


    • US Pronunciation
    • US IPA
    • [dee ley-er]
    • /di ˈleɪ ər/
    • US Pronunciation
    • US IPA
    • [dee ley-er]
    • /di ˈleɪ ər/

Definitions of d layer words

  • noun d layer the lowest area of the ionosphere, having increased ion density and existing only in the daytime: it begins at an altitude of about 70 km (c. 43 mi) and merges with the E layer 3
  • noun d layer the lowest region of the ionosphere, characterized by mounting electron and ion density: exists, during the day only, from about 43 to 50 miles (70 to 80 km) altitude. 1

Information block about the term

Origin of d layer

First appearance:

before 1930
One of the 10% newest English words
First recorded in 1930-35

Historical Comparancy

Parts of speech for D layer


d layer popularity

A pretty common term. Usually people know it’s meaning, but prefer to use a more spread out synonym. About 51% of English native speakers know the meaning and use word.
According to our data about 52% of words is more used. This is a rare but used term. It occurs in the pages of specialized literature and in the speech of educated people.

d layer usage trend in Literature

This diagram is provided by Google Ngram Viewer

See also

Matching words

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