原爆|げんばくgenbaku[0]heiban (flat)

1. nounatomic bomb; A-bomb
   原爆げんばくは人類じんるいにとって重大じゅうだいな脅威きょういだ。↗

   The atomic bomb is a grave threat to mankind.

• Synonym原子爆弾げんしばくだんNeutralThe formal full name for the atomic bomb, as in 「原子爆弾の投下」; found mostly in historical and scientific contexts.
• RelatedピカドンCasualColloquial name for the atomic bomb used by survivors in Hiroshima and Nagasaki, from the flash and the boom; carries a somber, historical weight.

「原爆」 is the everyday short form, as in 「原爆ドーム」 and 「原爆の日」. Use the formal full name 「原子爆弾」 in historical or scientific writing; 「ピカドン」 is a colloquial survivor's term with a somber historical ring.

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

1. 核分裂かくぶんれつの力ちからを利用りようして、大おおきな爆発ばくはつを起おこす爆弾ばくだん。