subsonic
sub-son-ic
adjective
Relating to speeds less than that of sound in a given medium.
"A subsonic aircraft flies slower than sound."
Thesaurus
Antonyms: sonic, supersonic, transonic
sub-son-ic
Relating to speeds less than that of sound in a given medium.
"A subsonic aircraft flies slower than sound."
Antonyms: sonic, supersonic, transonic