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Webster 1913 Edition

Noun.

[Gr. [GREEK] wet +

-scope

: cf. F.

hygroscope

(Physics)

An instrument which shows whether there is more or less moisture in the atmosphere, without indicating its amount.

Noun.

[Gr. moist, and to view.] The same as hygrometer. The latter is now chiefly used.

hygroscope ‎(plural hygroscopes)

instrument that indicates changes in atmospheric humidity