noun
sphygmophone
A medical instrument that converts the pulse into audible sound; used in physiological monitoring.
脈音器は脈拍を音に変換する装置です。
A sphygmophone is a device that converts the pulse into sound.
Compound of 脈 (myaku, 'pulse'), 音 (on, 'sound'), and 器 (ki, 'instrument'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.