姑奶 [－－]

Jyutping gu1 naai1
Pinyin gū nǎi

Definitions (粵典–words.hk)
  1. 名詞
    老公​嘅​家​姐
    elder sister of one's husband; sister-in-law
Definitions (Kaifangcidian)
  1. 大姑子

姑奶 [－－]

Jyutping gu1 naai4
Pinyin gū nǎi

Definitions (CC-CANTO)
  1. husband's elder sister
Definitions (Wiktionary)
  1. noun, Cantonese
    sister-in-law (husband's elder sister)
  2. noun, dialectal
    great-aunt (paternal grandfather's sister)
  3. intj, humorous
    goodnight