/ Dictionary / Index H hypernatremia: Meaning and Definition of Find definitions for: hy•per•na•tre•mi•a Pronunciation: (hī"pur-nu-trē'mē-u), [key] — n. Pathol. an abnormally high concentration of sodium in the blood. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypernatremia (Thesaurus) hypermotility hyperon Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language