noun
jammer; jamming device
A device that disrupts radio, radar, or other signals. Common in military and security contexts.
敵の通信を妨害するために妨害機が使われた。
A jammer was used to disrupt the enemy's communications.
noun
interceptor aircraft
Obsolete term for an aircraft designed to intercept enemy planes. Now replaced by 迎撃機.
第二次世界大戦中、妨害機は敵爆撃機を迎え撃つために開発された。
During World War II, interceptor aircraft were developed to engage enemy bombers.
The noun 'obstruction' or 'interference'; 妨害機 is a device that performs this action.
Compound of 妨害 (interference) + 機 (machine/aircraft). The second sense is obsolete and has been replaced by 迎撃機.