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Definition of: rhynchocephalian
(ring′kō·sə·fā′lē·ən) adjective
Pertaining to or designating a nearly extinct order of lizardlike reptiles (Rhynchocephalia), represented by only one genus (Sphenodon), the tuatara of New Zealand.
—noun One of the Rhynchocephalia. [<NL Rhynchocephalia, name of the order <Gk. rhynchos snout + kephalē head]
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