- 1. n the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846... n someone who can be employed as a detective to collect information n the scientist in charge of an experiment or research project n the 16th letter of the Greek alphabet n an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs Source: ecdict
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