hippo-
a combining form appearing in loanwords from Greek, where it meant “horse” (hippodrome); on this model, used in the formation of compound words (hippology).
Also
especially before a vowel,
hipp-.
Origin of hippo-
< Greek: combining form of
híppos; cognate with Latin
equus, Old Irish
ech, Old English
eoh, Sanskrit
aśvas, Lithuanian
ašvà