noun.
One who inquires or makes an inquisition, especially a questioner who is excessively rigorous or harsh.
The Century Dictionary and Cyclopedia
noun.
One who inquires or investigates; particularly, one whose official duty it is to inquire and examine: as, the inquisitors of the Holy Office or Inquisition.
noun.
An inquisitive or curious person.
the GNU version of the Collaborative International Dictionary of English
noun.
An inquisitive person; one fond of asking questions.
noun.
One whose official duty it is to examine and inquire, as coroners, sheriffs, etc.