Wiver; Wivern

Part of speech: noun (n.)

1. A fabulous two-legged, winged creature, like a cockatrice, but having the head of a dragon, and without spurs. [Written also wyvern.] The jargon of heraldry, its griffins, its mold warps, its wiverns, and its dragons. Sir W. Scott.

2. The weever.