An instrument used for examining the chest or other part by auscultation, the sounds of the heart, lungs, or other internal organs being conveyed…

a mechanical or (later) electrical device to assist hearing.

Originally: an instrument resembling a stethoscope, used to listen for the sound of air in the middle ear or Eustachian tube (now rare or disused)…

A name given independently to two improved forms of stethoscope: see quots.

A form of stethoscope in which sound is conveyed independently (by separate tubes) to the two ears. Cf. stethophone, n. Obsolete.

An instrument for the detection of sound by water; also of water, or of something in water, by sound. A bag containing water, placed between the…

an instrument for sounding the chest, a stethoscope.

A modified stethoscope used to detect and monitor fetal heart sounds.

Medicine. In full twin phonoscope A type of otoscope (otoscope, n. 1) consisting of the united earpiece sections of two stethoscopes. disused. rare.