WordWeb Online

1. The ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...
    
2. The 16th letter of the Greek alphabet

1. An antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs
   - protease inhibitor
    
2. The scientist in charge of an experiment or research project
   - principal investigator
    
3. Someone who can be employed as a detective to collect information and assist in criminal investigations
   - private detective, private eye, private investigator, operative, shamus, sherlock

Sounds like: phylum, um

Derived forms: PIs

Type of: alphabetic character, antiviral, antiviral agent, antiviral drug, detective, letter, letter of the alphabet, scientist, transcendental number

Part of: drug cocktail, Greek alphabet, HAART, highly active antiretroviral therapy

Encyclopedia: Pi, faith in chaos