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hygrodeik
hygrodeik n.
Brit. 
/ˈhʌɪɡrədʌɪk/
, /ˈhʌɪɡrədʌɪk/U.S. /ˈhaɪɡrəˌdaɪk/
[Greek δεικνύναι to show] a form of hygrometer consisting of a wet-bulb and a dry-bulb thermometer together with a scale on which the degree of humidity is shown by an index whose position depends on the height of the mercurial column in each./ˈhaɪɡrəˌdaɪk/Π
1867 O. W. Holmes Guardian Angel xiii. 154 The dry and wet bulbs of the ingenious ‘Hygrodeik’.
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