The winged horse, whose father was a griffin and mother a filly (Greek, hippos, a horse, and gryphos, a griffin). A symbol of love. (Ariosto: Orlando Furioso, iv. 18, 19.)
So saying, he caught him up, and without wing Of hippogrif, bore through the air sublime, Over the wilderness and o'er the plain.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894