/ Dictionary / Index H hygroscope: Meaning and Definition of Find definitions for: hy•gro•scope Pronunciation: (hī'gru-skōp"), [key] — n. an instrument that indicates the approximate humidity of the air. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hygroscope (Thesaurus) hygrophyte hygroscopic Related Content Daily Word Quiz: braggart Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language