noun
munitions industry; defense industry
Refers to the industrial sector that produces weapons, ammunition, and military equipment.
戦時中、軍需工業は急速に拡大した。
During the war, the munitions industry expanded rapidly.
Compound of 軍需 (military demand/supplies) and 工業 (industry). The exact historical derivation is uncertain, but the term became common during periods of military buildup.