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Definition of thermometer : An instrument for measuring temperature, founded on the principle that changes of temperature in bodies are accompained by proportional changes in their volumes or dimensions.

Synonyms:

oral thermometer, calorimeter, thermoscope, resistance thermometer, thermoelectric, telethermometer, clinical thermometer, thermo-regulator, regulator, anal thermometer, thermostat

mercury

Usage examples:

• There was a thermometer which used liquid such as water or alcohol in a glass tube instead of air. - "Our Legal Heritage, 4th Ed.", S. A. Reilly.
• At six o'clock the thermometer marked seven degrees above zero. - "The Lost Child 1894", François Edouard Joachim Coppée.
• 2. Wet the bulb of a thermometer with alcohol or water. - "Physiology and Hygiene for Secondary Schools", Francis M. Walters, A.M..