pneu·mo·tach·o·graph 
(n′mə-tăkə-grăf′, ny′-) or pneu·mo·tach·y·graph (-tabreve;kē-)
(n′mə-tăkə-grăf′, ny′-) or pneu·mo·tach·y·graph (-tabreve;kē-)n.
An apparatus for recording the rate of airflow to and from the lungs.
[PNEUMO- + Greek takhos, speed + -GRAPH.]
pneu′mo·tach′o·graphic adj.
pneu′mo·ta·chogra·phy (-tə-kŏgrə-fē) n.