a. [ Viper + -oid. ] (Zool.) Like or pertaining to the vipers. [ Webster 1913 Suppl. ]

{ ‖ } n. pl. [ NL. See Viper, and -oid. ] (Zool.) A division of serpents which includes the true vipers of the Old World and the rattlesnakes and moccasin snakes of America; -- called also Viperina. [ 1913 Webster ]