Hȳ-grōm'e-ter, n.

n. [Fr. hygromètre, from Gr. ὑγρός, wet, moist, and μέτρον, measure.] (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 which moment inclosed thermometer, compared with the air, gives the dew-point.