adjective Etymology: International Scientific Vocabulary Date: 1937 of, relating to, or being a speed less than that of sound in air, moving, capable of moving, or utilizing air currents moving at a ~ speed, infrasonic 1, ~ally adverb
SUBSONIC
Meaning of SUBSONIC in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012