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hygrograph
hygrograph n. 
/ˈhʌɪɡrəɡraf/,
Brit. /ˈhʌɪɡrəɡrɑːf/
, /ˈhʌɪɡrəɡrɑːf//ˈhʌɪɡrəɡraf/U.S. /ˈhaɪɡrəˌɡræf/
[Greek γραϕος- writing] an instrument for registering automatically the variations in the humidity of the air (Webster, 1864)./ˈhaɪɡrəˌɡræf/<
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