rust

[[t]rʌst[/t]]

n.

1) mel the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by oxidation

2) mel any film or coating on metal caused by oxidation

3) a stain resembling this coating

4) any growth, habit, or agency tending to injure or impair the mind, abilities, etc

5)

a) ppa any of several diseases of plants, characterized by reddish, brownish, or black pustules on the leaves, stems, etc., caused by fungi of the order Uredinales

b) ppa Also called rust′ fun`gus. a fungus causing this disease

c) any of several other diseases of unknown cause, characterized by reddish brown spots or discolorations on the affected parts

6) reddish yellow or reddish brown

7) mel to become or grow rusty, as iron

8) to contract rust

9) to deteriorate or become impaired, as through inaction or disuse

10) to become rust-colored

11) to affect with rust

12) to make rust-colored

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Etymology: bef. 900; (n.) OE rūst; (v.) ME rusten, der. of the n.; akin to red