'Investigator' definitions:

Definition of 'investigator'

From: WordNet
noun
A scientist who devotes himself to doing research [syn: research worker, researcher, investigator]
noun
Someone who investigates
noun
A police officer who investigates crimes [syn: detective, investigator, tec, police detective]

Definition of 'Investigator'

From: GCIDE
  • Investigator \In*ves"ti*ga`tor\, n. [L.: cf. F. investigateur.] One who searches diligently into a subject. [1913 Webster]

Definition of 'investigator'

From: GCIDE
  • Researcher \Re*search"er\ (-[~e]r), n. One who conducts research. In the field of scientific research, also called an investigator or scientist. [1913 Webster]