Etymology
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Pegasus 

famous winged horse in Greek mythology, also the name of an ancient northern constellation, late 14c., Pegase, from Latin, from Greek Pēgasos, usually said to be from pēgē "fountain, spring; a well fed by a spring" (plural pēgai), especially in reference to the "springs of Ocean," near which Medusa was said to have been killed by Perseus (Pegasus sprang from her blood). But this may be folk etymology, and the ending of the word suggests non-Greek origin.

Advances since the 1990s in the study of the Luwians, neighbors of the Hittites in ancient Anatolia, show a notable convergence of the Greek name with Pihaššašši, the name of a Luwian weather-god: "the mythological figure of Pegasus carrying the lightning and thunderbolt of Zeus, ... is likely to represent an avatar of the Luwian Storm-God of Lightning ...." [Alice Mouton, et al., eds., "Luwian Identities," 2013]

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hippogriff (n.)
also hippogryph, 1650s, from French hippogriffe (16c.), from Italian ippogrifo, from Greek hippos "horse" (from PIE root *ekwo- "horse") + Italian grifo, from Late Latin gryphus "griffin" (see griffin). A creature part griffin, but with body and hind parts in the form of a horse. "[A]pparently 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" [Century Dictionary].
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Andromeda 

northern constellation, 1667 (earlier Andromece, mid-15c.), from Greek, literally "mindful of her husband," from andros, genitive of anēr "man" (from PIE root *ner- (2) "man") + medesthai "to be mindful of, think on," related to medea (neuter plural) "counsels, plans, devices, cunning" (and source of the name Medea). In classical mythology the daughter of Cepheus and Cassiopeia, she was bound to a rock to be destroyed by the sea monster Cetus, but was rescued by Perseus, mounted on Pegasus. The whole group was transferred to the Heavens (except the rock).

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