Source : Webster's Revised Unabridged Dictionary (1913)

Inquirer \In*quir"er\, n. [Written also enquirer.]
   One who inquires or examines; questioner; investigator.
   --Locke.

         Expert inquirers after truth.            --Cowper.

Source : WordNet®

inquirer
     n : someone who asks a question [syn: {enquirer}, {questioner},
         {querier}, {asker}]