infrasonic


adjective

  1. noting or pertaining to a sound wave with a frequency below the audio-frequency range.
adj.

1927, from infra- + sonic.

adj.

  1. Generating or using waves or vibrations with frequencies below that of audible sound.

  1. Sound whose wave frequency is too low (under 15-20 hertz) to be heard by humans. Some animals, such as elephants and whales, emit calls at infrasound frequencies. See Note at ultrasound.

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