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English definition of “reptilian”

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adjective uk   /repˈtɪl.i.ən/ us  
specialized biology belonging to or like a reptile: reptilian skin/eyes disapproving used to describe an unpleasantly strange and unfriendly person or type of behaviour: He turned a cold, reptilian gaze on me.
(Definition of reptilian from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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