designating or of a frequency of mechanical vibrations below the range audible to the human ear, i.e., below c. sixteen vibrations per second
Word origin
infra- + sonic
infrasonic in American English
(ˌinfrəˈsɑnɪk)
adjective
noting or pertaining to a sound wave with a frequency below the audio-frequency range
Word origin
[1925–30; infra- + sonic]This word is first recorded in the period 1925–30. Other words that entered Englishat around the same time include: distinctive feature, gimmick, hot spot, payload, reflex camera
Examples of 'infrasonic' in a sentence
infrasonic
Elephants produce powerful sounds called rumbles in the infrasonic range, too deep to be heard by most people.