RUST

I. noun see: red Date: before 12th century 1. the reddish brittle coating formed on iron especially when chemically attacked by moist air and composed essentially of hydrated ferric oxide, a comparable coating produced on a metal other than iron by corrosion, something resembling ~ ; accretion , corrosive or injurious influence or effect, any of numerous destructive diseases of plants produced by fungi (order Uredinales) and characterized by usually reddish-brown pustular lesions, a strong reddish brown, II. verb Date: 13th century intransitive verb to form ~ ; become oxidized , to degenerate especially from inaction, lack of use, or passage of time , to become reddish brown as if with ~ , to be affected with a ~ fungus, transitive verb to cause (a metal) to form ~ , to impair or corrode by or as if by time, inactivity, or deleterious use, to cause to become reddish brown ; turn the color of ~