/ Dictionary / Index U undine: Meaning and Definition of Find definitions for: un•dine Pronunciation: (un-dēn', un'dēn), [key] — n. any of a group of female water spirits described by Paracelsus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undine (Thesaurus) undigestible undirected Related Content Daily Word Quiz: dispel Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language