Etymology
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tuatara (n.)

New Zealand lizard, 1844, from Maori, from tua "on the back" + tara "spine."

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Definitions of tuatara

tuatara (n.)
only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand;
Synonyms: Sphenodon punctatum
From wordnet.princeton.edu