The antonym for subsonic is supersonic.
Subsonic means "slower than the speed of sound" so a subsonic bullet is any bullet that travels slower than the speed of sound.
Subsonic - media server - was created on 2005-02-10.
types of airflow, functions of airflow, properties of airflow,
Supersonic
Transonic being past the speed of sound and subsonic is below the speed of sound.
subsonic is moving below the speed of sound, supersonic is faster than speed of sound
Subsonic signals are sounds or vibrations that have a frequency lower than that which may be heard by the human ear as a discernable tone. Vibrations lower than 30 Hz (30 cycles per second) are considered subsonic.
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Weird Connections - 2008 The Subsonic Chicken was released on: USA: 17 March 2009
Subsonic is below or slower than the speed of sound, and supersonic is above or faster than the speed of sound.
Subsonic means any speed below the speed of sound. (Mach 1). So subsonic aircraft range from 0 - 661 knots at sea level. (Mach 1 is 661 knots at sea level.)