Definition of F layer in English:

F layer

Syllabification: F lay·er

noun

The highest and most strongly ionized region of the ionosphere.

Origin

1920s: arbitrary use of F + layer.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day meretricious
Pronunciation: ˌmɛrɪˈtrɪʃəs
adjective
apparently attractive but having no real value...