pis

1. the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...Synonyms: pi

2. someone who can be employed as a detective to collect informationSynonyms: PI, operative, private detective, private eye, private investigator, shamus, sherlock

3. the scientist in charge of an experiment or research projectSynonyms: PI, principal investigator

4. the 16th letter of the Greek alphabetSynonyms: pi

5. an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugsSynonyms: PI, protease inhibitor