Search Result for "sky wave":
Wordnet 3.0

NOUN (1)

1. a radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth's surface; 



WordNet (r) 3.0 (2006):

sky wave
    n 1: a radio wave that is reflected back to earth by the
         ionosphere or a communications satellite; permits
         transmission around the curve of the earth's surface