![](https://webarchive.library.unt.edu/eot2008/20090514062105im_/http://www.cancer.gov/images/spacer.gif) |
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![](https://webarchive.library.unt.edu/eot2008/20090514062105im_/http://www.cancer.gov/images/spacer.gif)
| Looking back at events that have already taken place. |
Previous Definitions: | retinol, retinyl palmitate, retromolar trigone, retroperitoneal, retropubic prostatectomy | Next Definitions: | retrospective cohort study, retrospective study, retroviral vector, retrovirus, reverse transcription |
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![](https://webarchive.library.unt.edu/eot2008/20090514062105im_/http://www.cancer.gov/images/spacer.gif) |