[f. STETHO- + -phone as in TELEPHONE.] A name given independently to two improved forms of stethoscope: see quots.
1858. S. S. Alison, in Proc. Roy. Soc., IX. 197. An instrument which I have invented … and which, as it is specially adapted for the auscultation of differences in the sounds of different parts of the chest, I have named the Differential Stethoscope, or Stethophone.
1897. Canadian Engin., March, 329. [Instrument invented by Rev. D. B. Marsh, Hamilton, Ont. (Canadian patent 24 Nov. 1896)].
