thermotonometer

An instrument for measuring the degree of thermosystaltism, or muscular contraction under the influence of heat. [thermo- + G. tonos, tone, tension, + metron, measure]

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ther·mo·to·nom·e·ter (thur″mo-to-nomґə-tər) [thermo- + tono- + -meter] an instrument for measuring the amount of muscular contraction caused by heat.