Bible Dictionaries
Otacoustic
Webster's Dictionary
(1):
(n.) Alt. of Otacousticon
(2):
(a.) Assisting the sense of hearing; as, an otacoustic instrument.
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Bibliography Information
Webster, Noah. Entry for 'Otacoustic'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​o/otacoustic.html. 1828.