pi   (Sound)

The noun pi has 5 senses

• pi -- (the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...)


• private detective, PI, private eye, private investigator, operative, shamus, sherlock -- (someone who can be employed as a detective to collect information)


• principal investigator, PI -- (the scientist in charge of an experiment or research project)


• pi -- (the 16th letter of the Greek alphabet)


• 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)