acousticon|əˈkaʊstɪkən| [ad.Gr. ἀκουστικόν neut. sing. of ἀκουστικός acoustic.] An instrument for helping the deaf to hear. 1900in Dorland Med.Dict. (22/1).1920Chambers's Jrnl. 27 Nov. 831/2 An instrument known as ‘The Acousticon’, which we believe..to be a real boon to those suffering from deafness.