subsonic
Having a frequency too low to be audibleHaving a frequency too low to be audible
» Rotating machines are essential in subsonic aeronautical propulsion.
Meaning
4 senses(not comparable)Having a frequency too low to be audible
(literary, not comparable)Very quiet, almost inaudible
The noise of the ship was all around her. The faint subsonic rumble of the reactor and drive. (Leviathan Wakes, James S. A. Corey)
(not comparable)(aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)
дозвуково́йdozvukovój
(of speed) less than that of sound in a designated medium
(not comparable)With a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)
Examples
1 sentencesRotating machines are essential in subsonic aeronautical propulsion.