Viperoidea \Vi`per*oi"de*a\, Viperoides \Vi`per*oi"des\, 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]