investigational

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adjective

Of, or relating to investigating, or to an investigation.

“An expanded access protocol allows patients to benefit from an investigational drug prior to FDA approval.”

OriginProto-Indo-European *h₂élisder.? ← English investigation ← Middle English investigacioun →
Less commonScrabble 19
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Meanings

adjectiveinvestigational (not comparable)
  1. not comparableOf, or relating to investigating, or to an investigation.
  2. not comparablemedicineof, 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.

Origin

  1. Middle Englishinvestigacioun
  2. Englishinvestigation
  3. Proto-Indo-European*h₂el-
  4. Proto-Indo-European*h₂élisder.?
  5. Englishinvestigational

From investigation + -al.

Full word history & related roots →
Cite this entry
APA

investigational. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/investigational

MLA

“investigational.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/investigational. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “investigational,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/investigational.

Source: investigational on Wiktionary, CC BY-SA 4.0.