> as lemmas
otophone
otophone n.
Brit. 
/ˈəʊtə(ʊ)fəʊn/
, /ˈəʊtə(ʊ)fəʊn/U.S. /ˈoʊdəˌfoʊn/
a mechanical or (later) electrical device to assist hearing./ˈoʊdəˌfoʊn/ΘΚΠ
the world > health and disease > healing > audiology or audiometry > [noun] > aids to defective hearing
trunk1546
otacousticon1615
otacoustic1617
ear-spectacle1626
sarbacane1644
acoustic1659
acousticon1660
hearing-trumpet1725
ear trumpet1731
trumpet1774
otophone1839
auricle1864
audiphone1880
osteophone1892
microphonograph1897
hearing aid1922
deaf-aid1934
the world > health and disease > healing > diagnosis or prognosis > examination > [noun] > auscultation > instruments used in
stethoscope1820
otophone1839
otoscope1849
stethophone1858
phonoscope1859
hydrophone1860
thoracoscope1895
fetoscope1939
phonoscope1959
1839 ‘D. I. Moriarty’ Husband-hunter II. 109 Perceiving the otophone properly fixed.
1888 Amer. Ann. Deaf Jan. 85 Examination of 15 deaf persons in the Pennsylvania Inst. by means of Maloney's Otophone.
1904 Collier's 7 May 18/1 (advt.) The deaf are immediately able to hear ordinary conversation by the Magnetic Otophone Sound Waves, which penetrate the deafest ear.
1924 Times 29 Sept. 7/2 The Marconi Otophone is an efficient instrument for deaf people.
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