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Noun1.Vipera - type genus of the ViperidaeVipera - type genus of the Viperidae    
reptile genus - a genus of reptiles
family Viperidae, Viperidae - Old World vipers
common viper, Vipera berus, adder - small terrestrial viper common in northern Eurasia
asp, asp viper, Vipera aspis - of southern Europe; similar to but smaller than the adder