[1] : WordNet (r) 2.0

sonic barrier
     n : the increase in aerodynamic drag as an airplane approaches
         the speed of sound syn: sound barrier
see also:
sound barrier 

Sonic Barrier >> S Words
Sonic Barrier, definition of term: Sonic Barrier
sonic+barrier_pag1.html

Sonic >> S Words
Sonic, definition of term: Sonic
sonic_pag1.html

Barrier >> B Words
Barrier, definition of term: Barrier
barrier_pag1.html

Barrier Reefs >> B Words
Barrier Reefs, definition of term: Barrier Reefs
barrier+reefs_pag1.html

Sonic Boom >> S Words
Sonic Boom, definition of term: Sonic Boom
sonic+boom_pag1.html

Barrier Reef >> B Words
Barrier Reef, definition of term: Barrier Reef
barrier+reef_pag1.html

Sound Barrier >> S Words
Sound Barrier, definition of term: Sound Barrier
sound+barrier_pag1.html

Trade Barrier >> T Words
Trade Barrier, definition of term: Trade Barrier
trade+barrier_pag1.html

Sonic Depth Fin >> S Words
Sonic Depth Fin, definition of term: Sonic Depth Fin
sonic+depth+fin_pag1.html