pis Definition

pi¹
noun pis

1. The sixteenth letter of the Greek alphabet.
2. math.
This symbol (p), representing the ratio of the circumference of a circle to its diameter, in numerical terms 3.14159...

Derivative: pi-meson

See separate entry.

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pi² (slang)
adj

1. A short form of pious.

noun

pis
1. A pious, religious or sanctimonious person or talk.

Etymology: 19c.