from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb To challenge again.
  • verb To challenge in return.
  • verb medicine, pharmacology To try a therapeutic pharmaceutical drug, suspected allergen, or medical treatment on a patient a second or subsequent time, to see if the suspected effects of the treatment occur again. This is typically performed to confirm allergic or adverse reactions to allergens or medications, but may also be used to confirm beneficial treatments or to retry a probable beneficial treatment which did not appear to be effective previously.
  • noun A challenge made in return.
  • noun medicine, pharmacology The event of a rechallenge as above.


from Wiktionary, Creative Commons Attribution/Share-Alike License

re- +‎ challenge


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