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From combining form of Ancient Greek οὖς (oûs, ear) + ἀκουστικόν (akoustikón), neuter of ἀκουστικός (akoustikós, acoustic).


  • (UK) IPA(key): /əʊtəˈkuːstɪkɒn/


otacousticon (plural otacousticons)

  1. (now rare) An instrument to aid hearing, such as an ear trumpet or hearing aid.
    • 1621, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy, Oxford: Printed by Iohn Lichfield and Iames Short, for Henry Cripps, OCLC 216894069; The Anatomy of Melancholy, 2nd corrected and augmented edition, Oxford: Printed by John Lichfield and James Short, for Henry Cripps, 1624, OCLC 54573970, (please specify |partition=1, 2, or 3):
      , New York Review of Books, 2001, p.69:
      [] Gyges' invisible ring, or some rare perspective glass, or otacousticon, which would so multiply species that a man might hear and see all at once […].