風ふう船せん爆ばく弾だん

noun

fire balloon; balloon bomb

Historical military term for an experimental weapon launched by Japan during World War II; a balloon-borne incendiary device carried by the jet stream toward North America.

• 風ふう船せん爆ばく弾だんは、第だい二に次じ世せ界かい大たい戦せん中ちゅうに日本にほんが開かい発はつした兵へい器きの一ひとつだ。

  The fire balloon was one of the weapons developed by Japan during World War II.

• 風ふう船せん爆ばく弾だんの一いち部ぶは実じっ際さいにアメリカ本ほん土どに到とう達たつした。

  Some of the balloon bombs actually reached the mainland United States.