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Jyutping siu2 ji1 zi2
Pinyin xiǎo yí zi

Definitions (CC-CEDICT)
  1. (coll.) wife's younger sister; sister-in-law (term not used to directly address her)
Definitions (Wiktionary)
  1. noun
    sister-in-law (wife's younger sister)
    (syn.) 妻弟, 小姨崽 non-face-to-face, 姨仔 GT, 阿姨 non-face-to-face, 小姨子 non-face-to-face, 小姨仔, 姨妹子, 姨仔, 小姨妹兒, 妻姨, GT - General Taiwaneseno specific region identified), 細姨, 小姨媽, 小姨 face-to-face, 姨妹, 姨仔 also for elder sister, 小姨妹, 小姨子, 小姨, 小姨嫲