subsonic vs. supersonic
[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.
[soo-per-son-ik]
/ ˌsu pərˈsɒn ɪk /
adjective
-
greater than the speed of sound waves through air.
-
capable of achieving such speed.
a supersonic plane.
