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n.1.(Physics.) An instrument for measuring the acuteness of the sense of hearing.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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He noted that when examining subject's hearing with the use of a watch or acoumeter, one has to pay attention to the device's location, because the acuity of hearing depends on sound source location in relation to the subject's external auditory foramen [20].