The Collaborative International Dictionary
Stethometer
Stethometer \Ste*thom"e*ter\, n. [Gr. ? chest + -meter.] (Physiol.) An apparatus for measuring the external movements of a given point of the chest wall, during respiration; -- also called thoracometer.
Wiktionary
stethometer
n. An apparatus for measuring the external movements of a given point of the chest wall, during respiration.