the GNU version of the Collaborative International Dictionary of English
n. One who searches diligently into a subject.
The Century Dictionary and Cyclopedia
n. One who investigates or makes careful research.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who investigates
n. a police officer who investigates crimes
n. a scientist who devotes himself to doing research
Word Usage
"Schantag has posted him under "phonies and wannabees" on the POW Network website, and a Department of Veterans Affairs investigator is now looking into his record."