pi

noun

1. 1

   the 16th letter of the Greek alphabet

2. 2

   an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs

3. 3

   the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...

4. 4

   the scientist in charge of an experiment or research project

5. 5

   someone who can be employed as a detective to collect information