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Meaning of rhynchocephalian

rhyn•cho•ce•pha•lian

Pronunciation: (ring"kō-su-fāl'yun, -fā'lē-un), [key]
— adj.
  1. belonging or pertaining to the Rhynchocephalia, an order of lizardlike reptiles that are extinct except for the tuatara.
—n.
  1. a rhynchocephalian reptile.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.