infrasound

2.03  infrasound. Sound at frequencies less than 20 Hz. Annotation   A frequency of 20 Hz is the approximate lower limit of the range of human...

ultrasound

2.02  ultrasound.  Sound at frequencies greater than 20 kHz. Annotation              A frequency of 20 kHz is the limit of the approximate upper range of human hearing.

sound

2.01  sound. (a) Oscillation in pressure, stress, particle displacement, particle velocity, etc., propagated in a medium with internal forces (e.g., elastic or viscous), or the superposition of such propagated oscillation. (b) Auditory sensation evoked by...

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