"Rechallenge" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) Yes

"rechallenge" Definition

  1. a physiological or immunological challengemade subsequent to a previous challenge: such as
  2. the readministration of a drug or other substance suspected of causing a prior adverse reaction in order to determine a definitive link by observing the patient's reaction
  3. the readministration of an antineoplastic agent to a previously treated patient
  4. the subsequent transfer of a disease-causing agent (such as a virus or tumor cell) into a living organism and especially an experimental animal following immunotherapy for the purpose of determining robustness of the immunological response
  5. to challenge again

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