/ Dictionary / Index X xerostomia: Meaning and Definition of Find definitions for: xe•ro•sto•mi•a Pronunciation: (zēr"u-stō'mē-u), [key] — n. Pathol. dryness of the mouth caused by diminished function of the salivary glands due to aging, disease, drug reaction, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: xerostomia (Thesaurus) xerosis xerothermic Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language