pi
noun /paɪ/
/paɪ/
- (geometry
) the symbol π used to show the ratio of the circumference of (= distance around) a circle to its diameter (= distance across), that is 3.14159…几何 圆周率 - the 16th letter of the Greek alphabet (Π, π)
希腊字母表的第 16 个字母
词源Greek.