( n. pl. )
A division of serpents which includes the true vipers of the Old World and the rattlesnakes and moccasin snakes of America; -- called also Viperina.
( n. pl. )
A division of serpents which includes the true vipers of the Old World and the rattlesnakes and moccasin snakes of America; -- called also Viperina.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012