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Jyutping zat1 zi2
Pinyin zhí zǐ

Definitions (Wiktionary)
  1. noun
    proton
  2. noun, Judaism
    sephirah
  3. noun, historical
    prince sent to be held as a hostage in a neighbouring state in exchange for trust

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Jyutping zi3 zi2
Pinyin zhì zǐ

Definitions (粵典–words.hk)
  1. 名詞
    古時​東亞​被​送​去​其他​國家​做人​質​嘅​王子​,​以交換​條件​或者​達致​政治​平衡​(​量​詞​:​名​)
    a prince sent to be held as a hostage in a neighbouring state in ancient East Asia, in order to exchange prerequisites or to strike a political balance

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Jyutping zat1 zi2
Pinyin zhì zǐ

Definitions (CC-CEDICT)
  1. proton (positively charged nuclear particle)
  2. a prince sent to be held as a hostage in a neighbouring state in ancient China
Definitions (粵典–words.hk)
  1. 名詞
    一種​粒子​;​同​中子​加埋​組成​原子核​,​帶有​正電荷​,​質量​同​中子​差​唔​多​,​重過​電子​好多​(​量​詞​:​粒​)
    proton
Definitions (Wiktionary)
  1. noun
    proton
  2. noun, Judaism
    sephirah
  3. noun, historical
    prince sent to be held as a hostage in a neighbouring state in exchange for trust
Examples (粵典–words.hk)
  1. Cantonese
    质子
    質子
    • a prince sent to be held as a hostage in a neighbouring state in East Asia in ancient times
  2. Cantonese
    电子、中子、质子系亚原子粒子。
    電子、中子、質子係亞原子粒子。
    din6 zi2, zung1 zi2, zat1 zi2 hai6 aa3 jyun4 zi2 nap1 zi2.
    • Electrons, neutrons and protons are subatomic particles