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(in-VAH-lun-TAYR-ee)
![](https://webarchive.library.unt.edu/eot2008/20081103094757im_/http://www.cancer.gov/images/spacer.gif)
| An action that is not made by choice. In the body, involuntary actions (such as blushing) occur automatically, and cannot be controlled by choice. |
Previous Definitions: | inverted papilloma, investigational, investigational drug, investigator, inviable | Next Definitions: | involuntary nervous system, iodine, iodine I 131 metaiodobenzylguanidine, iodine I 131 monoclonal antibody BC8, iodine I 131 tositumomab |
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