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retro

[re-troh]
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adjective Informal.
  1. retroactive: retro pay.
  2. of or designating the style of an earlier time: retro clothes.
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Origin of retro

by shortening

retro-

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

< Latin, representing retrō (adv.), backward, back, behind
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for retro

retro

noun plural -ros
  1. short for retrorocket
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adjective
  1. denoting something associated with or revived from the pastretro dressing; retro fashion
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retro-

prefix
  1. back or backwardsretroactive
  2. located behindretrolental
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Word Origin

from Latin retrō behind, backwards
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for retro

adj.

1974, from French rétro (1973), supposedly first used of a revival c.1968 of Eva Peron-inspired fashions and short for rétrograde (see retrograde). There is an isolated use in English from 1768, and the word apparently was used in 19c. French as a term in billiards. As a noun, short for retro-rocket (1948) from 1961.

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retro-

word-forming element meaning "backwards; behind," from Latin retro (prep.) "backward, back, behind," also of time, "formerly, in past times," probably originally the ablative form of *reteros, based on re- "back" (see re-).

L. retro stands to re- as intro, "in, within"; to in, "in," and as citro, "hither," stands to cis, "on this side." [Klein]

Common in combinations in post-classical Latin (the classical equivalent was post-). Active in English as a word-forming element from mid-20c.

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Online Etymology Dictionary, © 2010 Douglas Harper

retro in Medicine

retro-

pref.
  1. Backward; back:retroposition.
  2. Situated behind:retroperitoneum.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.