[thur-muh-graf, -grahf]
a thermometer that records the temperatures it measures.

1830–40; thermo- + -graph Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thermograph (ˈθɜːməʊˌɡrɑːf, -ˌɡræf)
a type of thermometer that produces a continuous record of a fluctuating temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

thermograph ther·mo·graph (thûr'mə-grāf')

  1. A thermometer that records the temperature it indicates.

  2. The apparatus used in diagnostic thermography.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Thermograph data revealed that some portions of the lake were warmer than others.
Thermograph is an instrument that continuously records variations of temperature on a chart.
Water temperature was recorded daily on a thermograph.
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