Noun pi has 5 senses
  1. pi, 3.14159265358979323846... - the ratio of the circumference to the diameter of a circle
    --1 is a kind of irrational number
  2. private detective, PI, private eye, private investigator, operative, shamus, sherlock - someone who can be employed as a detective to collect information
    --2 is a kind of detective
    --2 has particulars:
     hotel detective, house detective, house dick; inquiry agent; store detective
  3. principal investigator, PI - the scientist in charge of an experiment or research project
    --3 is a kind of scientist, man of science
  4. pi - the 16th letter of the Greek alphabet
    --4 is a kind of
    letter, letter of the alphabet, alphabetic character
    --4 is a member of Greek alphabet
  5. 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
    --5 is a kind of antiviral, antiviral agent, antiviral drug
    --5 is a part of drug cocktail, highly active antiretroviral therapy, HAART
    --5 has particulars:
     indinavir, Crixivan; nelfinavir, Viracept; ritonavir, Norvir; saquinavir, Invirase
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