DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   pi
       n 1: the ratio of the circumference to the diameter of a circle;
            approximately equal to 3.14159265358979323846...
       2: someone who can be employed as a detective to collect
          information [syn: private detective, PI, private eye,
          private investigator, operative, shamus, sherlock]
       3: the scientist in charge of an experiment or research project
          [syn: principal investigator, PI]
       4: the 16th letter of the Greek alphabet
       5: an antiviral drug used against HIV; interrupts HIV
          replication by binding and blocking HIV protease; often used
          in combination with other drugs [syn: protease inhibitor,
          PI]