Subsonic
adjective
1.
noting or pertaining to a speed less than that of sound in air at the same height above sea level.
2.
infrasonic.
adjective
1.
being, having, or travelling at a velocity below that of sound: a subsonic aircraft
subsonic
(sŭb-sŏn’ĭk)
Having a speed less than that of sound in a designated medium, usually air; having a velocity less than Mach 1. Compare hypersonic, supersonic, transonic.
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