Snake. Source: A King James Dictionary. (Used with permission. Copyright © Philip P. Kapusta)
But when he saw many of the Pharisees and Sadducees come to his baptism he said unto them, O generation of VIPERS, who hath warned you to flee from the wrath to come? ( Matthew 3:7 )
Bibliography Information"Entry for 'Viper'". Dictionary of Words from the King James Bible. . New York, N.Y., 1999.