姐
姐 – Jie3 – Older Sister, Miss
妹 – Mei4 – Younger Sister
姐妹 – Jie3 Mei4 – Sisters
If you’re going to be in Flushing tomorrow, watch out… The four 姐妹 will be coming through.
Update! There’s also 姊 – Jie3 – Older Sister. According to Jenny, 姐 is usually used to mean “Miss”, but for actual sisters, you use 姊.
REPLY))
姊 is an older Chinese character, which is rarely used today.