subsonically


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subsonically

(ˌsʌbˈsɒnɪkəlɪ)
adv
(General Physics) at a velocity below that of sound
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References in periodicals archive ?
Overall, excepting bullets used in guns and shooting situations where most of the trajectory occurs while the bullet is traveling subsonically, pointed bullets have an overall edge for most applications.
99 where required by regulation to fly subsonically over land.
Since the 208 travels subsonically, I steered clear of the heavier bullet for trajectory purposes just in case we found ourselves needing to shoot to 200 or 300 yards.