noun
smokeless powder; smokeless gunpowder
Technical term for modern propellants that produce little smoke when fired.
現代の弾薬には無煙火薬が使われている。
Modern ammunition uses smokeless powder.
黒色火薬 is traditional black powder, which produces heavy smoke, while 無煙火薬 is a modern smokeless propellant.
Compound of 無煙 (smokeless) and 火薬 (gunpowder). The term is a direct calque from English 'smokeless powder'.