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

Category: Objects

2.Definition: someone who can be employed as a detective to collect information

Related Noun(s):operative, private detective, private eye, private investigator, shamus, sherlock

Category: People

3.Definition: the 16th letter of the Greek alphabet

Category: General

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

Category: General

5.Definition: the scientist in charge of an experiment or research project

Related Noun(s):principal investigator

Category: People