Etymology
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Words related to hippo-

*ekwo- 
Proto-Indo-European root meaning "horse." Perhaps related to *ōku- "swift."

It forms all or part of: alfalfa; Eohippus; equestrian; equine; equus; hippo-; hippocampus; Hippocratic; Hippocrene; hippocrepian; hippodrome; hippogriff; Hippolytus; hippopotamus; Philip; philippic; Philippines; Xanthippe.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit açva-, Avestan aspa-, Greek hippos, Latin equus, Old Irish ech, Old Church Slavonic ehu-, Old English eoh, Gothic aihwa- all meaning "horse."
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hippomania (n.)
"excessive fondness for horses" (especially in reference to the intense and passionate interest in horses developed in some girls between ages 10 and 14), 1956, from hippo- "horse" + mania.
hippomobile (n.)
1900, "A word used in the early days of motor vehicles for a horse-drawn vehicle" [OED], from French, from hippo- "horse" + ending from automobile.
hippophagy (n.)

"act or practice of feeding on horseflesh," 1823, from hippo- "horse" + -phagy "eating" (see -phagous). Ptolemy uses hippophagi of certain nomadic tribes of central Asia. Related: Hippophagous (1828).

Europeans have generally regarded horse-flesh as unfit for food; but hippophagy or horse-eating has always existed among some rude races, and has been advocated by many gastronomers in Europe. In Paris horse-flesh has long been surreptitiously dealt in as a cheap article of diet, and its sale, under strict official supervision, was authorized in 1866. The necessary use of it there during the siege of 1870-1 brought it into more general favor, which has been maintained. It is also eaten to some extent in other countries. [Century Dictionary, 1903]
hippophile (n.)
"horse-lover," 1852, from hippo- "horse" + -phile "one that loves."