/ Dictionary / Index H hypertonic: Meaning and Definition of Find definitions for: hy•per•ton•ic Pronunciation: (hī"pur-ton'ik), [key] — adj. of or pertaining to hypertonia. noting a solution of higher osmotic pressure than another solution with which it is compared (opposed to hypotonic). Cf. isotonic (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypertonic (Thesaurus) hypertonia hypertrichosis Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language