綿めん火か薬やくめんかやくMeanings1nounguncotton; cotton powderTechnical term for nitrocellulose used as a propellant or explosive.綿めん火か薬やくはニトロセルロースを主しゅ成せい分ぶんとする火か薬やくの一いっ種しゅです。Guncotton is a type of explosive whose main component is nitrocellulose.