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Jyutping zam1 tau4
Pinyin zhēn tóu

Definitions (Wiktionary)
  1. noun
    tip of a needle; needle head; pinhead
    (syn.) 針尖兒, 针尾, 针尖儿, 針尾
  2. noun, broadly
    needle, especially a syringe needle
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Wiktionary)
  1. Mandarin
    针头线脑的
    針頭線腦的
    zhēn tóu xiàn nǎo de
    • things such as needles and threads