| Thermometer (n.) An instrument for measuring temperature, founded on the principle that changes of temperature in bodies are accompanied by proportional changes in their volumes or dimensions. Thesaurus Entries calorimeter, clinical thermometer, cryometer, electric thermometer, galvanothermometer, gas thermometer, glass, meat thermometer, mercury, pyrometer, pyrometric cone, resistance pyrometer, telethermometer, thermal detector, thermocouple, thermoelectrometer, thermometrograph, thermostat |