Search Result for "barrage balloon":
Wordnet 3.0

NOUN (1)

1. an elongated tethered balloon or blimp with cables or net suspended from it to deter enemy planes that are flying low; 



WordNet (r) 3.0 (2006):

barrage balloon
    n 1: an elongated tethered balloon or blimp with cables or net
         suspended from it to deter enemy planes that are flying low