Definition of thermometer noun from the Oxford Advanced Learner's Dictionary

 

thermometer

 noun
noun
BrE BrE//θəˈmɒmɪtə(r)//
 
; NAmE NAmE//θərˈmɑːmɪtər//
 
Medical equipment
 
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an instrument used for measuring the temperature of the air, a person’s body, etc. a thermometer reading See related entries: Medical equipment Word Origin mid 17th cent.: from French thermomètre or modern Latin thermometrum, from thermo- ‘of heat’ + -metrum ‘measure’.Extra examples Check that the roast is cooked right through, using a meat thermometer. He stuck a thermometer in her mouth. If the thermometer reads 98.6°F, then you don’t have a fever. the reading on the thermometer
See the Oxford Advanced American Dictionary entry: thermometer