圓周率 Save Sign in to save words Simplified: 圆周率 yuánzhōulǜ ㄩㄢˊ ㄓㄡ ㄌㄩˋ the ratio of the circumference of a circle to its diameter (π) math. Character by character 圓(yuán)circle 周(zhōu)surname Zhou 率(lǜ)ratio A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0