Wyvern folklore is rarely fire-breathing like the four-legged dragon. Sometimes modern fantasy book and media authors have wyverns that are frost-breathing or poison-breathing instead of fire-breathing. The current spelling "wyvern" is not attested before the seventeenth century as "winged two-footed dragon". According to the Oxford English Dictionary, it is an alteration of Middle English "wyver" (attested thirteenth century), from Anglo-French "wivre" (cf. French "guivre" and "vouivre"), which originate from Latin "vīpera", meaning "viper", "adder", or "asp". Conversely, medievalist William Sayers proposes a more complex origin for the term. He notes that the Anglo-French "guivre" and its Middle English derivative ceased to
Vauxhall Wyvern new body. 5313 were made. After only six months production of the rebodied Wyvern the car received, in April 1952, Vauxhall's new short stroke 1508 cc four-cylinder engine. Along with its six -cylinder Velox version, the new engine had a bore of 79.3mm and a stroke of 76.2mm, identical measurements (and therefore capacity) as the rival Ford Consul/Zephyr engines introduced two years previously. With a power output of 45 bhp at 4,000rpm, maximum speed rose to . More performance was available from the six-cylinder Vauxhall Velox and (from 1954) Cresta versions. The EIX series Wyvern received a new bonnet and