noun
implements of war; military equipment
A somewhat formal or technical term for weapons, arms, and other military hardware. Not an everyday word; more likely to appear in historical or military contexts.
軍器の近代化が急務とされた。
Modernization of military equipment was considered an urgent task.
Compound of 軍 (gun, 'military') and 器 (ki, 'tool, utensil'). The exact historical derivation is uncertain, but the meaning follows directly from the kanji components.