Word:

supersonic

su`per`son´ic
a.1.Moving at a speed greater than the speed of sound in air; - this speed varies with altitude, since the speed of sound varies with altitude, as well as with temperature and humidity, being approximately 1129 feet per second at sea level and 984 feet per second at 16 miles altitude.
2.Capable of moving at speeds higher than the speed of sound; - of aircraft.
Adj.1.supersonic - (of speed) greater than the speed of sound in a given medium (especially air); "a supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon"
Antonyms:
sonic, transonic - (of speed) having or caused by speed approximately equal to that of sound in air at sea level; "a sonic boom"
subsonic - (of speed) less than that of sound in a designated medium; "aircraft flying at subsonic speeds"
2.supersonic - having frequencies above those of audible sound
Synonyms: ultrasonic
inaudible, ultrasonic, unhearable
Translate supersonic to German, Translate supersonic to French
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-- supersonic --
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