HYGROMETER
hygrometer
(noun) measuring instrument for measuring the relative humidity of the atmosphere
Source: WordNet® 3.1
Etymology
Noun
hygrometer (plural hygrometers)
(meteorology) An instrument that measures the humidity of the air or other gases, especially the relative humidity.
Anagrams
• hygrometre
Source: Wiktionary
Hy*grom"e*ter, n. Etym: [Gr. -meter: cf. F. hygromètre.] (Physics)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition