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Webster 1913 Edition

Noun.

[L.]

A searcher; an explorer; an investigator.

[Obs.]

Searched into by such skillful

indagators

of nature.

Boyle.

Noun.

A searcher; one who seeks or inquires with diligence. [Little used.]

indagator ‎(plural indagators)

an investigator
- 1661, Robert Boyle, The Sceptical Chymist, p. 5-6:
  For that, being the number of the Elements, Principles, or Materiall Ingredients of Bodies, is an enquiry whole truth is of that Importance, and of that Difficulty, that it may as well deserve as require to be searched into by such skilfull Indagators of Nature as your selves.

indāgātor