Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Assisting the sense of hearing.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Assisting the sense of hearing.
  • n. An instrument to facilitate hearing, as an ear trumpet.

from The Century Dictionary and Cyclopedia

  • Assisting the sense of hearing: as, an otacoustic instrument.
  • n. An instrument to facilitate hearing; especially, an ear-trumpet.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

oto- +‎ acoustic

Examples

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