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Related to subsonic: subsonic speed
1. Of less than audible frequency.
2. Having a speed less than that of sound in a designated medium.
(General Physics) being, having, or travelling at a velocity below that of sound: a subsonic aircraft.
1. noting or pertaining to a speed less than that of sound in air at the same height above sea level.
Of or pertaining to speeds less than the speed of sound. See also speed of sound.
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|Adj.||1.||subsonic - (of speed) less than that of sound in a designated medium; "aircraft flying at subsonic speeds"|
sonic, transonic - (of speed) having or caused by speed approximately equal to that of sound in air at sea level; "a sonic boom"
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"