From The Collaborative International Dictionary of English v.0.44 [gcide]:
Hygrometer \Hy*grom"e*ter\, noun [Gr. ? wet, moist + -meter: cf. F. hygrom['e]tre.] (Physics) An instrument for measuring the degree of moisture of the atmosphere.
{Daniell's hygrometer}, a form of hygrometer consisting of a bent glass tube terminating in two bulbs, the one covered with muslin, the other of black glass, and containing ether and a thermometer. Ether being poured on the muslin, the black ball, cooled by the evaporation of the ether within, is soon covered with dew; at this moment, the inclosed thermometer gives the dew-point, and this, compared with the reading of one in the air, determines the humidity.
From WordNet (r) 2.0 [wn]:
noun
1: measuring instrument for measuring the relative humidity of the atmosphere
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
25 Moby Thesaurus words for "hygrometer": aerological instrument, aneroid barometer, aneroidograph, barograph, barometer, barometrograph, glass, hair hygrometer, humidor, hurricane-hunter aircraft, hygrodeik, hygrograph, hygroscope, hygrostat, hygrothermograph, psychrometer, radiosonde, recording barometer, sling psychrometer, vacuometer, weather balloon, weather instrument, weather satellite, weather vane, weatherglass
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