noun
iron rust; iron hydroxide
Refers to the reddish-brown substance formed on iron when it oxidizes; also used in chemistry for iron hydroxide (水酸化鉄).
See also: 水酸化鉄 (すいさんかてつ)
古い鉄橋には鉄さびが浮いていた。
Iron rust had formed on the old iron bridge.
鉄さびは水酸化鉄とも呼ばれる。
Iron rust is also called iron hydroxide.
Compound of 鉄 (てつ, 'iron') and 錆 (さび, 'rust'). The reading さび is the native Japanese word for rust.