Main entry: protease inhibitor, PI
Definition: an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs
Main entry: pi
Definition: the 16th letter of the Greek alphabet
Main entry: principal investigator, PI
Definition: the scientist in charge of an experiment or research project
Main entry: private detective, private eye, private investigator, PI, operative, shamus, sherlock
Definition: someone who can be employed as a detective to collect information
Main entry: pi
Definition: the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...