Poly acoustic
An Illustrated Dictionary of Medicine, Biology and Allied Sciences · 1907 · p. 37
(pol-e-ak-oos' -tik). I. Multiplying sound. 2. An instrument for intensifying sound.
Bu kavram başka kaynaklarda da geçiyor
Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
The American Illustrated Medical Dictionary (1913)
Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
Chamber's Twientieth Century Dictionary (1908)
Nuttall's Standard Dictionary of the English Language (1890)
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
Zell's Condensed Dictionary (1879)
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