Viperoidea

{ ‖Vi′per‐oi″de‐a (?), Vi′per‐oi″des (?), } n. pl. [NL. See Viper, and -oid.] (Zoöl.) A division of serpents which includes the true vipers of the Old World and the rattlesnakes and moccasin snakes of America; — called also Viperina.