The Collaborative International Dictionary
Phrenograph
Phrenograph \Phre"no*graph\, n. [Gr. ?, ?, the migriff + -graph.] (Physiol.) An instrument for registering the movements of the diaphragm, or midriff, in respiration.
Wiktionary
phrenograph
n. (context physiology English) An instrument for registering the movements of the diaphragm, or midriff, in respiration.