[sub.son.ic] adj [ISV] (1937) 1: of, relating to, or being a speed less than that of sound in air
2: moving, capable of moving, or utilizing air currents moving at a subsonic speed
3: infrasonic 1 -- sub.son.i.cal.ly adv
[sub.son.ic] adj [ISV] (1937) 1: of, relating to, or being a speed less than that of sound in air
2: moving, capable of moving, or utilizing air currents moving at a subsonic speed
3: infrasonic 1 -- sub.son.i.cal.ly adv
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012