潜水艦|せんすいかんsensuikan[0]heiban (flat)

1. nounsubmarine
   潜水艦せんすいかんは沈しずんで二に度どと浮上ふじょうしなかった。↗

   The submarine sank, never to rise again.

• SynonymサブマリンNeutralLoanword for a submarine, stylistically neutral; in baseball it also means an underhand pitch. 「潜水艦」 is the formal military term.
• Synonym潜水艇せんすいていWrittenIn formal prose, a small submersible for ocean research; also a small military submarine for special-forces transport or crew training. 「潜水艦」 is a large warship.

For military submarines, 「潜水艦」 is the default — the formal term for a large warship. Use 「潜水艇」 for small submersibles: research craft, or small military subs for special forces or training. 「サブマリン」 is the loanword, also an underhand baseball pitch.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 魚雷ぎょらいや機雷きらい、ミサイル、艦砲かんぽうなどを装備そうびし水中すいちゅうや水面すいめん上じょうを隠密おんみつに高速こうそくで航行こうこうできる大型おおがたの軍艦ぐんかん。