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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.
any film or coating on metal caused by oxidation.
a stain resembling this coating.
any growth, habit, influence, or agency tending to injure, deteriorate, or impair the mind, character, abilities, usefulness, etc.
Plant Pathology.

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.
Also called rust fungus. a fungus causing this disease.
any of several other diseases of unknown cause, characterized by reddish-brown spots or discolorations on the affected parts.

reddish yellow, reddish brown, or yellowish red.
verb (used without object)
to become or grow rusty, as iron.
to contract rust.
to deteriorate or become impaired, as through inaction or disuse.
to become rust-colored.
verb (used with object)
to affect with rust.
to impair as if with rust.
to make rust-colored.
having the color rust.
Verb phrases
rust out, (of metal pipes, machinery, etc.) to decay and become unusable through the action of rust.
rust through, to develop holes, breaks, or the like, because of rust.
rust together, to join two metal pieces, as iron pipes, by causing the joint to rust.
a reddish-brown oxide coating formed on iron or steel by the action of oxygen and moisture
(plant pathol) Also called rust fungus

any basidiomycetous fungus of the order Uredinales, parasitic on cereal plants, conifers, etc
any of various plant diseases characterized by reddish-brown discoloration of the leaves and stem, esp that caused by the rust fungi


a strong brown colour, sometimes with a reddish or yellowish tinge
(as adjective): a rust carpet

any corrosive or debilitating influence, esp lack of use
to become or cause to become coated with a layer of rust
to deteriorate or cause to deteriorate through some debilitating influence or lack of use: he allowed his talent to rust over the years

rust (rŭst)
Any of a group of parasitic fungi of the order Uredinales that are plant pathogens, especially of cereal grains, and that can produce allergy in humans when inhaled in large numbers.

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.

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.

Any of the various plant diseases caused by these fungi.

Verb To become corroded or oxidized.
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Read Also:

  • Rust-joint

    noun 1. (in plumbing and metalwork) a watertight joint made between two pieces by rusting them together.

  • Rustle

    verb (used without object), rustled, rustling. 1. to make a succession of slight, soft sounds, as of parts rubbing gently one on another, as leaves, silks, or papers. 2. to cause such sounds by moving or stirring something. 3. to move, proceed, or work energetically: Rustle around and see what you can find. verb (used […]

  • Rustler

    noun 1. a cattle thief. 2. a person or thing that rustles. 3. Informal. an active, energetic person. noun 1. (mainly US & Canadian) a cattle or horse thief 2. (US & Canadian, informal) an energetic or vigorous person

  • Rustless

    adjective 1. free from rust. 2. rustproof.

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