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Jyutping ji5 hung1 gwai2 zai2
Pinyin ěr kōng guǐ zǎi

Definitions (Wiktionary)
  1. noun, Min-Nan
    eardrum
    (syn.) 耳鼓, 耳镜, 耳膜, 耳鏡, 鼓膜, 耳膜仔