Poly acoustic
Nuttall's Standard Dictionary of the English Language · 1890 · p. 139
pol-e-a-kow'-stik, a. that multiplies or magnifies sound: s. an instrument which does so (Gr. poly, many, and acoustic)
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Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
The American Illustrated Medical Dictionary (1913)
Chamber's Twientieth Century Dictionary (1908)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
Zell's Condensed Dictionary (1879)
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