/ Dictionary / Index H hyperhidrosis: Meaning and Definition of Find definitions for: hy•per•hi•dro•sis Pronunciation: (hī"pur-hi-drō'sis), [key] — n. Pathol. abnormally excessive sweating. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hyperhidrosis (Thesaurus) hypergolic hyperinflate Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language