Rhynchocephalia Rhynchocephali • rhynchocephalian · · · Info · Definitions · Characters · · Rhynchocephalia · · Text Latin · · Script 15 · · Length Definitions · · · (noun) tuataras; extinct forms from middle Triassic. Synonyms: order Rhynchocephalia. · · Noun Definition 1 Characters · · R latin capital letter r U+0052 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 y latin small letter y U+0079