This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Variant of wyvern.

n. Alternative spelling of wyvern.

n. In heraldry, a monster whose fore part is that of a dragon with its fore legs and wings, while the hinder part has the form of a serpent with a barbed tail.

n. a fire-breathing dragon used in medieval heraldry; had the head of a dragon and the tail of a snake and a body with wings and two legs

"And while the fallen king stared with burning eyes that reflected the bitter rage and humiliation that ate his heart, the squires stripped Valannus of mail shirt, burganet and leg-pieces, and clad him in Conan's armor of black plate-mail, with the vizored salade, and the dark plumes nodding over the wivern crest."

dragon    firedrake