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The Collaborative International Dictionary of English v.0.48 (gcide)

Hygrometer \Hy*grom"e*ter\, n. [Gr. ? wet, moist -meter: cf.
F. hygrom[`e]tre.] (Physics)
An instrument for measuring the degree of moisture of the
atmosphere.
[1913 Webster]

{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. Hygrometric