From combining form of Ancient Greek οὖς (oûs, “ear”) + ἀκουστικόν (akoustikón), neuter of ἀκουστικός (akoustikós, “acoustic”).
otacousticon (plural otacousticons)
- (now rare) An instrument to aid hearing, such as an ear trumpet or hearing aid.
- 1621, Robert Burton, The Anatomy of Melancholy, 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 […].