subsonic


sub·son·ic

adjective \ˌsəb-ˈsä-nik\

: slower than the speed of sound

Full Definition of SUBSONIC

1
:  of, relating to, or being a speed less than that of sound in air
2
:  moving, capable of moving, or utilizing air currents moving at a subsonic speed
3
:  infrasonic 1
sub·son·i·cal·ly \-ni-k(ə-)lē\ adverb

Origin of SUBSONIC

International Scientific Vocabulary
First Known Use: 1937

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