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Reptilia (n.)

in biology, the class of cold-blooded, scaled vertebrates including the reptiles proper, mid-17c., from Latin plural of reptile (see reptile; also see -a (2)).

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Definitions of Reptilia from WordNet

Reptilia (n.)
class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates; once the dominant land animals;
Synonyms: class Reptilia
From wordnet.princeton.edu