1. The ratio of the circumference to the diameter of a circle;
    Approximately equal to 3.14159265358979323846... (synset 113776148)
  2. Someone who can be employed as a detective to collect information (synset 110496256)
  3. The scientist in charge of an experiment or research project (synset 110494748)
  4. The 16th letter of the Greek alphabet (synset 106848790)
  5. An antiviral drug used against HIV;
    Interrupts HIV replication by binding and blocking HIV protease;
    Often used in combination with other drugs (synset 104020369)

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