n. a mythical beast, half griffin and half horse, supposedly the offspring of a griffin and a filly.
the GNU version of the Collaborative International Dictionary of English
n. A fabulous winged animal, half horse and half griffin.
The Century Dictionary and Cyclopedia
n. A fabulous creature, like a griffin, but with hoofs and other parts resembling a horse, apparently invented, in imitation of Pegasus, by the romancers of the middle ages, and furnished to their heroes as a means of transportation through the air.
Word Usage
"On closer scrutiny, we find that this creature, as fabled as the hippogriff, is just as uncertain as everyone else."