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retroflection
retroflex
retroflexion
retrograde
retrogress
retrogression
retrolental
retronym
retropack
retroposon
retropulsion
retrorocket
retrorse
retrospect
retrospective
retrosynthetic
retrotransposon
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retroact

ret·ro·act [ rèttrō ákt ] (past and past participle ret·ro·act·ed, present participle ret·ro·act·ing, 3rd person present singular ret·ro·acts)


intransitive verb 
Definition:
 
1. be in opposition: to act in a way that opposes something else

2. apply to past: to apply to things that have happened in the past

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