What is the meaning of Hygrograph?

(n.) An instrument for recording automatically the variations of the humidity of the atmosphere.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). hygrograph. Retrieved September 20, 2026, from http://smartdefine.org/hygrograph/definitions/2018197
ChicagoWebster's. 2011. "hygrograph" http://smartdefine.org/hygrograph/definitions/2018197 (accessed September 20, 2026).
HarvardWebster's 2011, hygrograph, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/hygrograph/definitions/2018197>.
MLAWebster's. "hygrograph" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/hygrograph/definitions/2018197>