Search Result for "radar echo":
Wordnet 3.0

NOUN (1)

1. an electronic signal that has been reflected back to the radar antenna; contains information about the location and distance of the reflecting object; 



WordNet (r) 3.0 (2006):

radar echo
    n 1: an electronic signal that has been reflected back to the
         radar antenna; contains information about the location and
         distance of the reflecting object