thermometer

[ther-mom-i-ter]
noun
an instrument for measuring temperature, often a sealed glass tube that contains a column of liquid, as mercury, that expands and contracts, or rises and falls, with temperature changes, the temperature being read where the top of the column coincides with a calibrated scale marked on the tube or its frame.

Origin:
1615–25; thermo- + -meter

thermometric [thur-muh-me-trik] , thermometrical, adjective
thermometrically, adverb
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World English Dictionary
thermometer (θəˈmɒmɪtə)
 
n
clinical thermometer gas thermometer resistance thermometer thermocouple See also pyrometer an instrument used to measure temperature, esp one in which a thin column of liquid, such as mercury, expands and contracts within a graduated sealed tube

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Etymonline
Word Origin & History

thermometer
1633, from Fr. thermomètre (1624), coined by Jesuit Father Leuréchon from Gk. thermos "hot" (see thermal) + metron "measure" (see meter (2)). An earlier, Latinate form was thermoscopium (1617). The earliest such device was Galileo's air-thermometer, invented c.1597.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

thermometer ther·mom·e·ter (thər-mŏm'ĭ-tər)
n.
An instrument for measuring temperature.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
thermometer   (thər-mŏm'ĭ-tər)  Pronunciation Key 
An instrument used to measure temperature. There are many types of thermometers; the most common consist of a closed, graduated glass tube in which a liquid expands or contracts as the temperature increases or decreases. Other types of thermometers work by detecting changes in the volume or pressure of an enclosed gas or by registering thermoelectric changes in a conductor (such as a thermistor or thermocouple).
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Scientists have designed a new kind of thermometer that uses noise to measure
  temperature.
Heat the oil slowly, watching the temperature rise with a candy thermometer
  placed in the oil.
Using an oven thermometer ensures that the oven is at the correct temperature
  for baking.
Her temperature was too low to register on a thermometer.
Image for thermometer
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