TOPIK 4noun철cheol철이 · 철을ironExample철은 물에 오래 닿으면 녹이 슬어요.Iron rusts if it touches water for a long time.Word parts철 ironHomonym warning: native 철 means 'season', as in 제철 'in season'.Good to know철이 들다 is a different, native 철: it means 'to grow up, to mature'.Related words금속 metal강철 steel녹 rust