/ Dictionary / Index Q quadricycle: Meaning and Definition of Find definitions for: quad•ri•cy•cle Pronunciation: (kwod'ru-sī"kul), [key] — n. a vehicle similar to the bicycle and tricycle but having four wheels. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quadric surface quadriennial Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language