SINCE 1828
Rhynchocephalia
plural noun
Rhyn·cho·ce·pha·lia
| \ ˌriŋ(ˌ)kōsə̇ˈfālyə, -ālēə\
Definition of Rhynchocephalia
: an order of Reptilia that comprises forms resembling lizards but having biconcave vertebrae, immovable quadrate bones, and other peculiar osteological characters and that includes Sphenodon and numerous fossil genera — compare tuatara
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Merriam-Webster unabridged
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