CIDE DICTIONARY
hygrometer, n. [Gr. wet, moist + -meter: cf. F. hygromètre.].
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.
THESAURUS
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
ROGET THESAURUS
hygrometer
Moisture
N
moisture, moistness, humidity, humectation, madefaction, dew, serein, marsh, hygrometry,
hygrometer, moist, damp, watery, madid, roric, undried, humid, sultry, wet, dank, luggy, dewy, roral, rorid, roscid, juicy, wringing wet, soaking wet, wet through to the skin, saturated, swashy, soggy, dabbled, reeking, dripping, soaking, soft, sodden, sloppy, muddy, swampy, irriguous.