noun
Rare military term for a rapid-fire anti-aircraft weapon; more commonly referred to as 対空機関砲 or simply 高射砲.
旧日本軍の資料には「高射機関砲」という表記が見られる。
The notation '高射機関砲' can be found in documents of the former Japanese military.
Compound of 高射 (anti-aircraft) + 機関砲 (automatic cannon). The exact historical derivation is uncertain; the term appears in older military contexts.