PI • DICTIONARY ONE.COM • Definition of PI

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/paɪ/ Listen

noun

The ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846....

Someone who can be employed as a detective to collect information. Synonyms: operative, private detective, private eye, private investigator, shamus, sherlock.

The scientist in charge of an experiment or research project. Synonym: principal investigator.

The 16th letter of the Greek alphabet.

An antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs. Synonym: protease inhibitor.

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Etymology of 'Pi'

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"Pi" Quotes from Famous Books

... jerk and a grimace, as if some inner force compelled. "I can't talk pi-jaw—on this subject or any other. You ...

— Charles Rex • Ethel M. Dell

... came aboard, the mess declared it was too long, so they cut off the 'h' and the 'as' and 'm' and called me Tom Pi; but even then they were not content, for they further docked it of its fair proportions, and decided that I was to be named Topi, though ...

— Paddy Finn • W. H. G. Kingston

... striking absurdity of the Jain reverence for life has frequently been commented upon. Almost every city of western India, where they are found, has its beast-hospital, where animals are kept and fed. An amusing account of such an hospital, called Pi[n]jra Pol, at Saurar[a]shtra, Surat, is given in the first number of the Journal of the Royal Asiatic Society.[35] Five thousand rats were supported in such ...

— The Religions of India - Handbooks On The History Of Religions, Volume 1, Edited By Morris Jastrow • Edward Washburn Hopkins

... Asa had taken a notion that they would like to join the Delta Pi fraternity. To their disgust, however, they were blackballed, some among the members objecting to receiving fellows with their known reputation ...

— The Boys of Columbia High on the Gridiron • Graham B. Forbes

... altering their political structures I came to grief again. In the process of binding together twenty or more of the neighboring tribes in order to settle rival claims, I was given the over-lordship of the federation. But Old Pi-Une was the greatest of the under-chiefs,—a king in a way,—and in relinquishing his claim to the supreme leadership he refused to forego all the honors. The least that could be done to appease him was for me to marry his daughter Ilswunga. Nay, he demanded it. I offered to abandon the ...

— A Daughter of the Snows • Jack London

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