subsonic

[ suhb-son-ik ]
/ sʌbˈsɒn ɪk /

adjective

noting or pertaining to a speed less than that of sound in air at the same height above sea level.
infrasonic.

Origin of subsonic

1940–45; sub- + -sonic

OTHER WORDS FROM subsonic

sub·son·i·cal·ly, adverb

Words nearby subsonic

subsoil, subsoil plow, subsoiler, subsolar, subsong, subsonic, subspace, subspecialty, subspecies, subspecific, subspinale

Example sentences from the Web for subsonic

  • And its booming notes descended to subsonic throbbings that gripped and wrung the nerves to anguish.

    The Record of Currupira |Robert Abernathy

  • Most of their conversation is carried on in tones of subsonic frequency, so your ears cannot hear it.

    The Asses of Balaam |Gordon Randall Garrett

British Dictionary definitions for subsonic

subsonic
/ (sʌbˈsɒnɪk) /

adjective

being, having, or travelling at a velocity below that of sound a subsonic aircraft

Scientific definitions for subsonic

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.