a) having a frequency too low to be audible
b) less than the speed of sound (in the same medium, and at the same temperature and pressure)

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  • subsonic — [subsän′ik] adj. [ SUB + SONIC] 1. designating, of, or moving at a speed in a surrounding fluid less than that of sound in the same fluid 2. INFRASONIC …   English World dictionary

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  • subsonic — adjective Etymology: International Scientific Vocabulary Date: 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 •… …   New Collegiate Dictionary

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