DICTIONARY ENTRY
4 SYLLABLES
appleton layer
/'æpəltən_'leɪər/ · æpəltənleɪər
Appleton layer has 4 syllables: ap · ple · ton lay · er.
ap
01
ple
02
ton lay
03
er
04
noun. The highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission.
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