安あん全ぜん帽ぼうあんぜんぼうMeanings1nounsafety helmet; hard hat; crash helmetGeneral term for protective headgear used in construction, factories, cycling, etc.工こう事じ現げん場ばでは安あん全ぜん帽ぼうを着ちゃく用ようしてください。Please wear a safety helmet at the construction site.自じ転てん車しゃに乗の