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Medical Definition of Pneumotachograph
1. An instrument for measuring the instantaneous flow of respiratory gases. Synonym: pneumotachometer. Fleisch pneumotachograph, a pneumotachograph that measures flow in terms of the proportional pressure drop across a resistance consisting of numerous capillary tubes in parallel. Silverman-Lilly pneumotachograph, a pneumotachograph that measures flow in terms of the proportional pressure drop across a resistance consisting of a very fine mesh screen. (05 Mar 2000)