/ Dictionary / Index U undulatory: Meaning and Definition of Find definitions for: un•du•la•to•ry Pronunciation: (un'ju-lu-tôr"ē, -tōr"ē, un'dyu-, -du-), [key] — adj. moving in undulations. having the form or appearance of waves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: undulatory (Thesaurus) undulation undulatory theory Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language