retro-

American Heritage® Dictionary of the English Language, Fourth Edition

1. Backward; back: retrorocket.
2. Situated behind: retrolental.
3. Contrary to a usual or natural course or direction: retrograde.

Century Dictionary and Cyclopedia

1. n. A prefix of Latin origin, meaning ‘back’ or ‘backward,’ ‘behind’: equivalent to post-, and the opposite of ante- (also of pre- or pro-) with reference to place or position, rarely to time; sometimes also equivalent to re- and opposed to pre- or pro-. It corresponds to opistho- in words from the Greek.
2. Backward.

Wiktionary

1. back or backward
2. behind
3. in the opposite direction
4. informal in an old-fashioned or old-school way

GNU Webster's 1913

1. A prefix or combining form signifying backward, back.

WordNet 3.0

1. adj. affecting things past
2. n. a fashion reminiscent of the past