View your list of saved words. (You can log in using Facebook.)
Definition of F2 LAYER
: the upper of the two layers into which the F region of the ionosphere splits in the daytime at varying heights from about 120 miles (200 kilometers) to more than 300 miles (500 kilometers) above the earth
First Known Use of F2 LAYER
Next Word in the Dictionary: ftr Previous Word in the Dictionary: FTP All Words Near: F2 layer
Seen & Heard
What made you want to look up F2 layer? Please tell us where you read or heard it (including the quote, if possible).