[Fr., from L, vivus, living; and pareo, I beget.] A poisonous serpent; so named because it was the only serpent that was supposed to bring forth its young alive. The varieties include the common viper, the asp, the African horned viper, with a horny scale over each eye, Indian viper, and the red viper or copper-head, an animal like a rattlesnake without the rattles.