Retro-

·- A prefix or combining form signifying backward, back; as, retroact, to act backward; retrospect, a looking back.

retro
rē̆trō, adv. [from re and the pronominal suffix ter, as in citro, ultro, intro, etc.]. I Lit., of p...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
retro
retrō adv. —Of motion, backward, back, to the rear: vestigia sequor, V.: ora Flectit, O....

An Elementary Latin Dictionary