photohemotachometer

An appliance for recording photographically the rapidity of the blood current. [photo- + G. haima, blood, + tachos, speed, + metron, measure]

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pho·to·he·mo·ta·chom·e·ter (fo″to-he″mo-tə-komґə-tər) [photo- + hemo- + tacho- + -meter] a device for making a photographic record of the speed of the blood current.