Audiometer
The American Dictionary and Cyclopedia · 1907 · p. 49
An instrument to measure and record the acutene of hearing; a combination of the telephone, microphonic key, and battery.
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Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
Hawkins' Electrical Dictionary (1915)
The American Illustrated Medical Dictionary (1913)
Everybody's Encyclopedia (1912)
Chamber's Twientieth Century Dictionary (1908)
Chandler's Encyclopedia (1898)
The Student's Medical Dictionary (1896)
The Standart Electrical Dictionary (1892)
An Illustrated Encyclopaedic Medical Dictionary (1891)
Nuttall's Standard Dictionary of the English Language (1890)
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