Definition of "reptilia" [‖Rep•til•i•a]

• Plural form of reptilium. (noun)
• Plural form of reptilian. (Animals of the class Reptilia) (noun)

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• "Aves are descendants of reptiles, but they are excluded from reptilia, so reptilia is not a clade."
• "But anyway if we go by the diagram on wikipedia - reptilia is a clade and it includes aves."
• "But the traditional class reptilia is not a clade."