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Jyutping gat1 zi2
Pinyin jī zhǐ

Definitions (Wiktionary)
  1. noun, Cantonese
    card stock
    (syn.) 卡纸, 卡紙

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Jyutping kaat1 zi2
Pinyin jī zhǐ

Definitions (CC-CANTO)
  1. cardboard, thick paper
Definitions (Kaifangcidian)
  1. 硬卡紙 – 硬卡纸