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