a prefix occurring in loanwords from Latin meaning “backward” (retrogress ); on this model, used in the formation of compound words (retrorocket ).

< Latin, representing retrō (adv.), backward, back, behind Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  back or backwards: retroactive
2.  located behind: retrolental
[from Latin retrō behind, backwards]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

prefix meaning "backwards, behind," from L. retro (prep.) "backward, back, behind," probably originally the ablative form of *reteros, based on re- "back." Common in combinations in post-classical Latin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

retro- pref.

  1. Backward; back: retroposition.

  2. Situated behind: retroperitoneum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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