The Chinese word for leaf is
叶

yè

Translations for leaf and their definitions

葉
1. leaf; petal
紅葉 - red autumn leaves
2. era; epoch
十九世紀中後葉 - middle and late 19th century -
3. leaf-like thing
肺葉 - lobe of the lung
百葉窗 - Venetian blinds
一葉扁piān舟 - a tiny boat
4. Alternative form of 頁 (page)
^葉 ^飛 - Ye Fei (Chinese military general and politician of the People's Republic of China)
5. Ye County, Henan, China
6. (Min) Alternative form of 箬 (-, t=leaf)

葉子
1. n. leaf; foliage
樹木每年都重chóng新長zhǎng出葉子zi。 - The trees renew their foliage every year.
2. n. (slang) marijuana
飛葉子zi - to smoke marijuana -