Dictionary Check: rust

of the brown color of rust

a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture

a plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi

the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water

any of various fungi causing rust disease in plants

A strong reddish brown color.