Word.ws English Dictionary

investigational

investigational adjective: of, or relating to investigating, or to an investigation.

Adjective

investigational (not comparable)

  1. Of, or relating to investigating, or to an investigation.
  2. 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.

Origin of investigational

From investigation + -al.

Words formed from investigational

Questions about investigational

What does investigational mean?
Investigational means of, or relating to investigating, or to an investigation.
What part of speech is investigational?
Investigational is an adjective.

Words near investigational in the dictionary

  1. investigatest
  2. investigatin'
  3. investigating
  4. investigatingly
  5. investigation
  6. investigational
  7. investigationally
  8. investigations
  9. investigative
  10. investigative journalism
  11. investigative journalist

Source and license

Adapted from Wiktionary: investigational (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “investigational.” Word.ws, https://word.ws/investigational. Based on Wiktionary, CC BY-SA 4.0.