WYVERN, or WIVERN, the name of an heraldic monster, with the forepart of a winged dragon and the hind part of a serpent or lizard (see HERALDRY). The earlier spelling of the word was wilier or wivere; O. Eng. wyvre; O. Fr. wivre, mod. givre. It is a doublet of " viper," with an excrescent n, as in " bittern," M. Eng. bitore.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)