The term subsonic can refer to speed that's lower than the speed of sound. In computer terms, this could mean an open source media server or refer to programming code.
The correct term for this is subsonic, not infrasonic. And yeah, I wouldn't want to go above the speed of sound in a hang glider! So, yes, they fly subsonic.
The antonym for subsonic is supersonic.
You could use "hypersonic." It is not a precise synonym, as subsonic is below the threshhold of hearing, whereas hypersonic would be above it. Supersonic would refer to velocity faster than the speed of sound, whereas subsonic also refers to velocities slower than those of the speed of sound. Sonic velocities are a consideration in jet aircraft design and with bullets and marksmanship. Subsonic rifle bullets tend to be more accurate than hypersonic ones
to what does the term coed refer
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.
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Supersonic
Transonic being past the speed of sound and subsonic is below the speed of sound.
The term extraterrestrial can be adjective or noun. In adjective case, the term extraterrestrial refer occurring or existing beyond the earth's atmosphere. In noun case, the term extraterrestrial refer being from the beyond the earth's atmosphere.
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.