wy ‧ vern /ˈwaɪvən $ -ərn/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: wyver 'viper, wyvern' (14-17 centuries) , from Old North French wivre , from Latin vipera ; ⇨ ↑ viper ]
an imaginary animal that has two legs and wings and looks like a ↑ dragon