prefix
Etymology: Middle English, from Latin, from retro, adverb, backward, back, behind, from re- back, again + -tro (as in intro inwardly) — more at re- , intro-
1.
a. : backward : back : retroverse
retro mingent
retro -rocket
retro serrate
b. : back in time : past
retro dict
retro cognition
2.
a. : situated behind
retro choir
b. : situated behind a (specified) part
retro auricular
retro pubic
3. : contrary to the usual or natural course : retrograde
retro infection