A hearing aid or deaf aid is an electro-acoustic device which is designed to amplify sound for the wearer, usually with the aim of making speech more intelligible, and to correct impaired hearing as measured by audiometry.
ɐ hˈɪɹɪŋ ˈeɪd ɔːɹ dˈɛf ˈeɪd ɪz ɐn ɪlˌɛktɹoʊɐkˈuːstɪk dɪvˈaɪs wˌɪtʃ ɪz dɪzˈaɪnd tʊ ˈæmplᵻfˌaɪ sˈaʊnd fɚðə wˈɛɹɚ, jˈuːʒuːəli wɪððɪ ˈeɪm ʌv mˌeɪkɪŋ spˈiːtʃ mˈoːɹ ɪntˈɛlɪdʒəbəl, ænd tə kɚɹˈɛkt ɪmpˈɛɹd hˈɪɹɪŋ æz mˈɛʒɚd baɪ ˌɔːdɪˈoʊmətɹi.