Dictionary: rhynchocephalian   (rĭng'kō-sə-fāl'yən)

Of or belonging to the Rhynchocephalia, an order of mostly extinct lizardlike reptiles that includes the tuatara.

A rhynchocephalian reptile.

[From New Latin Rhynchocephalia, order name : Greek rhunkhos, beak + Greek kephalē, head; see cephalic.]