甲こう鉄てつ

noun, noun which may take the genitive case particle 'no'

armor plate; armor

Refers to heavy metal plating used for protection, especially on warships or armored vehicles. Also used attributively with の.

• 戦せん艦かんの甲こう鉄てつは厚あつさが数すう十じゅうセンチもあった。

  The battleship's armor plate was several tens of centimeters thick.

• 甲こう鉄てつの扉とびらが閉しまると、中なかは完かん全ぜんな密みっ室しつになった。

  When the armored door closed, the inside became a completely sealed room.