thermometer; clinical thermometer
Refers specifically to a device for measuring body temperature, typically a clinical thermometer. In everyday use, it can also refer to digital or infrared thermometers used at home or in medical settings.
I take my temperature with a thermometer every morning.
Electronic thermometers are often used in hospitals.
I took my temperature with a thermometer, and it was 38 degrees.
I had my child hold the thermometer under their armpit to take their temperature.