rusting definition | Dictionary.com

rust

[ruhst]

–noun

1.	Also called iron rust. 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.	any film or coating on metal caused by oxidation.

3.	a stain resembling this coating.

4.	any growth, habit, influence, or agency tending to injure, deteriorate, or impair the mind, character, abilities, usefulness, etc.

Plant Pathology.

a.	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.	Also called rust fungus. 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, reddish brown, or yellowish red.

–verb (used without object)

7.	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.

–verb (used with object)

11.	to affect with rust.

12.	to impair as if with rust.

13.	to make rust-colored.

–adjective

14.	having the color rust.

—Verb phrases

15.	rust out, (of metal pipes, machinery, etc.) to decay and become unusable through the action of rust.

16.	rust through, to develop holes, breaks, or the like, because of rust.

17.	rust together, to join two metal pieces, as iron pipes, by causing the joint to rust.

Origin:
bef. 900; (n.) ME; OE rūst; c. G Rost; (v.) ME rusten, deriv. of the n.; akin to red

Synonyms:
2. corrosion. 9. decay, decline.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rust (rŭst)

Any of various powdery or scaly reddish-brown or reddish-yellow hydrated ferric oxides formed on iron and iron-containing materials by low-temperature oxidation in the presence of water.
Any of various metallic coatings, especially oxides, formed by corrosion.
A stain or coating resembling iron rust.
Deterioration, as of ability, resulting from inactivity or neglect.
Botany
1. Rust fungus.
2. A plant disease caused by a rust fungus, characterized by reddish or brownish spots on leaves, stems, and other parts.
A strong brown.

v. rust·ed, rust·ing, rusts

v. intr.

v. tr.

[Middle English, from Old English rūst; see reudh- in Indo-European roots.]
rust adj., rust'a·ble adj.

rust (rŭst) Pronunciation Key
Noun

Any of the various reddish-brown oxides of iron that form on iron and many of its alloys when they are exposed to oxygen in the presence of moisture.
1. Any of various basidiomycete fungi that are parasitic on plants and produce reddish or brownish spots on leaves. Rusts attack a wide variety of plants and can cause enormous damage to crops.
2. Any of the various plant diseases caused by these fungi.

Verb To become corroded or oxidized.

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