|1.||a reddish-brown oxide coating formed on iron or steel by the action of oxygen and moisture|
|2.||plant pathol Also called: rust fungus|
|a. any basidiomycetous fungus of the order Uredinales, parasitic on cereal plants, conifers, etc|
|b. any of various plant diseases characterized by reddish-brown discoloration of the leaves and stem, esp that caused by the rust fungi|
|3.||a. a strong brown colour, sometimes with a reddish or yellowish tinge|
|b. (as adjective): a rust carpet|
|4.||any corrosive or debilitating influence, esp lack of use|
|5.||to become or cause to become coated with a layer of rust|
|6.||to deteriorate or cause to deteriorate through some debilitating influence or lack of use: he allowed his talent to rust over the years|
|[Old English rūst; related to Old Saxon, Old High German rost]|
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.
|rust (rŭst) Pronunciation Key
Verb To become corroded or oxidized.
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