retro-, retr- (Latin: back, backward, behind; used as a prefix).retroaction: 
retroactive: 
retroauricular: 
retrocede: 
retrocession: 
retrocolic: 
retrocursive: 
retroflection: 
retroflex: 
retroflexion: 
retrograde: 
retrography: 
retrogress: 
retrogression: 
retrogressive: 
retrolingual: 
retromammary: 
retromorphosis: 
retrorocket: 
retrorse: 
retrospect: 
retrospection: 
retrosternal: 
retroversion: 
retrovirus: 
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