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investigational

From Wiktionary, the free dictionary

English

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Etymology

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From investigation +‎ -al.

Adjective

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investigational (not comparable)

  1. Of, or relating to investigating, or to an investigation.
  2. (medicine) of, or relating to an unapproved drug or chemical entity being studied.
    An expanded access protocol allows patients to benefit from an investigational drug prior to FDA approval.
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