otacoustic

== English == === Etymology === From oto- +‎ acoustic. === Adjective === otacoustic (not comparable) (archaic) Assisting the sense of hearing. === Noun === otacoustic (plural otacoustics) (archaic) A kind of ear trumpet. === References === “otacoustic”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.