from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. A posture of winged quadrupeds, a shorthand for "rampant, wings elevated and addorsed".
from The Century Dictionary and Cyclopedia
- In heraldry, rising on the hind legs, usually with the wings raised or indorsed: an epithet noting the griffin: equivalent to rampant and salient.
Sorry, no etymologies found.
Most charmingly, there is an array of heraldic beasts: lions passant, dragons rampant, griffins segreant and more.