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Jyutping zit3 zi2
Pinyin jiē zi

Definitions (Wiktionary)
  1. noun
    furuncle; boil
    (syn.) 熱結, 粒結仔, 粒结仔, 热结

癤子 [疖-]

Jyutping
Pinyin jiē zi

Definitions (CC-CEDICT)
  1. (medicine) boil
  2. furuncle
  3. knot (in wood)