鉄てつさび

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)

• 古ふるい鉄てっ橋きょうには鉄てつさびが浮ういていた。

  Iron rust had formed on the old iron bridge.

• 鉄てつさびは水すい酸さん化か鉄てつとも呼よばれる。

  Iron rust is also called iron hydroxide.