The Collaborative International Dictionary
Sphygmophone
Sphygmophone \Sphyg"mo*phone\, n. [Gr. ??? the pulse + ??? sound.] (Physiol.) An electrical instrument for determining by the ear the rhythm of the pulse of a person at a distance.
Wiktionary
sphygmophone
n. (context physiology English) An electrical instrument for determining by ear the rhythm of the pulse of a person at a distance.