noun the ratio of the circumference to the diameter of a circle.
noun someone who can be employed as a detective to collect information.
— synonyms: private_detective, private_eye, private_investigator, operative, shamus, sherlock
noun the scientist in charge of an experiment or research project.
— synonyms: principal_investigator
noun the 16th letter of the Greek alphabet.
noun an antiviral drug used against HIV.
— synonyms: protease_inhibitor
Examples
“In computing, pi characters may be entered with special key combinations.”