Bible Dictionaries
Microcoustic

Webster's Dictionary

(1):

(a.) Pertaining, or suited, to the audition of small sounds; fitted to assist hearing.

(2):

(n.) An instrument for making faint sounds audible, as to a partially deaf person.

Bibliography Information
Webster, Noah. Entry for 'Microcoustic'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​m/microcoustic.html. 1828.