妹 (mui6 mui2) — address to a woman who is younger to the speaker and of the same generation in Cantonese
muiˍ₆妹Mandarin Pinyin: mei4
Meaning of 妹
nounaddress to a woman who is younger to the speaker and of the same generation
nounyounger sister
noun(noun) used to address a general young girl or lady in a polite way, especially a customer (it is like "madam")