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thermometer

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A thermometer is a tool used to measure temperature. (noun)

An example of a thermometer is a little stick with mercury in it that tells you how hot it is outside or how high your fever is.

See thermometer in Webster's New World College Dictionary

noun

an instrument for measuring temperatures, consisting of a graduated glass tube with a sealed, capillary bore in which mercury, colored alcohol, etc. rises or falls as it expands or contracts from changes in temperature
any similar instrument, as one operating by means of a thermocouple

Related Forms:

thermometric adjective
thermometrically adverb

See thermometer in American Heritage Dictionary 4

(thər-mŏmˈĭ-tər)

noun

An instrument for measuring temperature, especially one having a graduated glass tube with a bulb containing a liquid, typically mercury or colored alcohol, that expands and rises in the tube as the temperature increases.

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