聲吶 [声呐]

Jyutping sing1 naap6
Pinyin shēng nà

Definitions (CC-CEDICT)
  1. sonar (loanword)
Definitions (粵典–words.hk)
  1. 名詞
    用聲波​嚟​探測​距​離​嘅​一​種​技​術​，​常見​用途​係​探測海​牀​嘅​深度​、​船​嘅​位置​等
    SONAR, sound navigation and ranging
  2. 參看
    聲納
Definitions (Wiktionary)
  1. noun
    Synonym of 聲納／声纳 (shēngnà, “sonar”).
    (syn.) 聲納, 声纳