rust

¹rust

noun \ˈrəst\

Definition of RUST

1

a : the reddish brittle coating formed on iron especially when chemically attacked by moist air and composed essentially of hydrated ferric oxide b : a comparable coating produced on a metal other than iron by corrosion c : something resembling rust : accretion

2

: corrosive or injurious influence or effect

3

: any of numerous destructive diseases of plants produced by fungi (order Uredinales) and characterized by usually reddish-brown pustular lesions; also : a fungus causing this

4

: a strong reddish brown

Examples of RUST

1. an old pump covered in rust

Origin of RUST

Middle English, from Old English rūst; akin to Old English rēad red — more at red

First Known Use: before 12th century

Rhymes with RUST

bust, crust, dust, gust, just, lust, must, musth, thrust, trust