Pronunciation: (re'trō), [key]
1. retroactive: retro pay.
2. of or designating the style of an earlier time: retro clothes.
a prefix occurring in loanwords from Latin meaning “backward” (retrogress); on this model, used in the formation of compound words (retrorocket).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.