phonocardiograph
/ˌfəʊnəʊˈkɑːdɪə(ʊ)ɡrɑːf/ /ˌfəʊnəʊˈkɑːdɪə(ʊ)ɡraf/Medicine
noun
Any of various instruments that record or display phonocardiograms.
Origin
Early 20th century; earliest use found in The Lancet. From phono- + cardiograph s.v. cardio-, after phonocardiogram.