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Jyutping gong3 kwai1
Pinyin gāng kuī

Definitions (Wiktionary)
  1. noun
    helm; military helmet
    (syn.) 鐵帽, 铁帽
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

鋼盔 [钢-]

Jyutping
Pinyin gāng kuī

Definitions (CC-CEDICT)
  1. metal helmet
  2. (military) helmet
Examples (粵典–words.hk)
  1. Cantonese
    戴钢盔行骑楼底
    戴鋼盔行騎樓底
    daai3 gong3 kwai1 haang4 ke4 lau2 dai2
    • to be extremely careful; literally: to walk under the veranda with a helmet on