hygrograph

[hahy-gruh-graf, -grahf]
noun
a self-recording hygrometer.

Origin:
1860–65; hygro- + -graph

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Collins
World English Dictionary
hygrograph (ˈhaɪɡrəˌɡrɑːf, -ˌɡræf)
 
n
an automatic hygrometer that produces a graphic record of the humidity of the air

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American Heritage
Science Dictionary
hygrograph   (hī'grə-grāf')  Pronunciation Key 
A hygrometer that records variations in atmospheric humidity.
The American Heritage® Science Dictionary
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Example sentences
We were informed that a new thermo- hygrograph was available and the unserviceable thermo-hygrograph would be replaced.
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