Search Result for "sonic barrier":
Wordnet 3.0

NOUN (1)

1. the increase in aerodynamic drag as an airplane approaches the speed of sound;
[syn: sonic barrier, sound barrier]



WordNet (r) 3.0 (2006):

sonic barrier
    n 1: the increase in aerodynamic drag as an airplane approaches
         the speed of sound [syn: sonic barrier, sound barrier]