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pi | the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846... | |
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private eye, private detective, PI, private investigator, operative, shamus, sherlock, gumshoe, dick, private dick | someone who can be employed as a detective to collect information | |
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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 | |
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PI, principal investigator | the scientist in charge of an experiment or research project | |
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pi | the 16th letter of the Greek alphabet |