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wyvern

wy·vern [ wvərn ] (plural wy·verns) or wi·vern [ wvərn ] (plural wi·verns)


noun 
Definition:
 
creature in heraldry: in heraldry, a mythical being depicted as having two legs, a dragon's head, wings, and a long tail

[Late 16th C. Via Old French wivre< Latin vipera "snake"]
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