sphygmotonometer

An instrument, like the sphygmotonograph, for determining the degree of blood pressure. [sphygmo- + G. tonos, tension, + metron, measure]

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sphyg·mo·to·nom·e·ter (sfig″mo-to-nomґə-tər) [sphygmo- + tonometer] an instrument for measuring the elasticity of the arterial walls.