1 Definition in the Yahoo! Kids Dictionary
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"KIDS HOME STUDY REFERENCE DICTIONARY HOME WORD: thermometer

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ther·mom·e·ter  audio 
(thr-mm-tr)  See the pronunciation key 

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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