/ Dictionary / Index R rhynchocephalian: Meaning and Definition of Find definitions for: rhyn•cho•ce•pha•lian Pronunciation: (ring"kō-su-fāl'yun, -fā'lē-un), [key] — adj. belonging or pertaining to the Rhynchocephalia, an order of lizardlike reptiles that are extinct except for the tuatara. —n. a rhynchocephalian reptile. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rhyming slang rhyolite Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language