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hygrothermograph
hygrothermograph n. 
/ˌhʌɪɡrə(ʊ)ˈθəːməɡraf/,
Brit. /ˌhʌɪɡrə(ʊ)ˈθəːməɡrɑːf/
, /ˌhʌɪɡrə(ʊ)ˈθəːməɡrɑːf//ˌhʌɪɡrə(ʊ)ˈθəːməɡraf/U.S. /ˌhaɪɡrəˈθərməˌɡræf/
an instrument that records the temperature and humidity of the air on a single chart./ˌhaɪɡrəˈθərməˌɡræf/ΘΚΠ
the world > the earth > weather and the atmosphere > weather > study or science of weather > meteorological instruments > [noun] > hygroscope > instrument recording humidity and temperature
hygrothermograph1929
1929 J. E. Weaver & F. E. Clements Plant Ecol. xi. 264 It is convenient for comparison to record both humidity and air temperature upon the same record sheet... Such an instrument is called a hygrothermograph.
1969 Ecology 50 742/1 Hygrothermograph readings were taken..at three elevations above ground and four exposures.
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