Etymology
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thermograph (n.)

"automatic self-registering thermometer," 1881, from thermo- + -graph "instrument for recording; something written." Related: Thermographic.

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Definitions of thermograph

thermograph (n.)
medical instrument that uses an infrared camera to reveal temperature variations on the surface of the body;
thermograph (n.)
a thermometer that records temperature variations on a graph as a function of time;
Synonyms: thermometrograph
From wordnet.princeton.edu