In heraldry, a mythical creature that is half-wyvern, typically depicted as having the upper body of a wyvern and the lower body of another animal.
From 'demi-' (half) + 'wyvern' (a two-legged dragon in heraldry). 'Wyvern' comes from Old French 'wivre', related to 'viper', originally meaning a serpent. The term developed in medieval heraldic traditions.
Heraldry is basically medieval creative writing—families invented half-creatures like demiwiverns to prove they were cooler than their neighbors, and some of these wild combinations actually got passed down legally for centuries!
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