Etymology : Middle English, from Old English rust; akin to Old English rEad red; more at RED
Pronunciation : r&st
Function : noun
Date : before 12th century
1. flaky orange coating which forms on metal due to the oxidation of iron; fungal disease of plants characterized by reddish or brown spots on the leaves and stem (Botany). become corroded due to the oxidation of iron, become rusty. rust\rust\ , n. [as. rust; akin to d. roest, g. & sw. rost, icel. ry?; -- named from its color, and akin to e. red. ?113. see:
red.].
2. (chem.) the reddish yellow coating formed on iron when exposed to moist air, consisting of ferric oxide or hydroxide; hence, by extension, any metallic film of corrosion.
3. (bot.) a minute mold or fungus forming reddish or rusty spots on the leaves and stems of cereal and other grasses (trichobasis rubigo-vera), now usually believed to be a form or condition of the corn mildew (puccinia graminis). as rust, it has solitary reddish spores; as corn mildew, the spores are double and blackish.note: rust is also applied to many other minute fungi which infest vegetation, such as the species of ustilago, uredo, and lecythea.
4. that which resembles rust in appearance or effects. specifically: (a) a composition used in making a rust joint. see:
rust joint, below. (b) foul matter arising from degeneration; as, rust on salted meat. (c) corrosive or injurious accretion or influence. sacred truths cleared from all rust and dross of human mixtures.note: rust is used in the formation of compounds of obvious meaning; as, rust-colored, rust-consumed, rust-eaten, and the like.rust joint, a joint made between surfaces of iron by filling the space between them with a wet mixture of cast-iron borings, sal ammoniac, and sulphur, which by oxidation becomes hard, and impervious to steam, water, etc.rust mite (zo?l.), a minute mite (phytopius oleivorus) which, by puncturing the rind, causes the rust-colored patches on oranges.rust \rust\, v. i. [imp. & p. p. rusted; p. pr. & vb. n. rusting.] [as. rustian.].
5. to contract rust; to be or become oxidized. if gold ruste, what shall iron do? our armors now may rust.
6. to be affected with the parasitic fungus called rust; also, to acquire a rusty appearance. as plants.
7. fig.: to degenerate in idleness; to become dull or impaired by inaction. must i rust in egypt? never more appear in arms, and be the chief of greece?rust \rust\, v. t.
8. to cause to contract rust; to corrode with rust; to affect with rust of any kind. keep up your bright swords, for the dew will rust them.
9. fig.: to impair by time and inactivity.rust of the color of rust [syn: rusty] n.
10. a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture.
11. a reddish-brown discoloration of leaves and stems caused by a rust fungus.
12. the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water [syn: rusting].
13. any of various fungi causing rust disease in plants [syn: rust fungus ] v 1: become destroyed by water, air, or an etching chemical such as an acid; "the metal corroded"; "the pipes rusted" [syn: corrode] 2: cause to deteriorate due to the action of water, air, or an acid; "the acid corroded the metal"; "the steady dripping of water rusted the metal stopper in the sink" [syn: corrode, eat].
14. The reddish yellow coating formed on iron when exposed to moist air, consisting of ferric oxide or hydroxide; hence, by extension, any metallic film of corrosion.
15. A minute mold or fungus forming reddish or rusty spots on the leaves and stems of cereal and other grasses , now usually believed to be a form or condition of the corn mildew.
16. As rust, it has solitary reddish spores; as corn mildew, the spores are double and blackish.
17. That which resembles rust in appearance or effects.
18. A composition used in making a rust joint.
19. See Rust joint, below.
20. Foul matter arising from degeneration; as, rust on salted meat.
21. Corrosive or injurious accretion or influence.
22. To contract rust; to be or become oxidized.
23. To be affected with the parasitic fungus called rust; also, to acquire a rusty appearance, as plants.
24. To degenerate in idleness; to become dull or impaired by inaction.
25. To cause to contract rust; to corrode with rust; to affect with rust of any kind.
26. To impair by time and inactivity. any of various fungi causing rust disease in plants the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water a reddish-brown discoloration of leaves and stems caused by a rust fungus a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture become coated with oxide of the color of rust.
27. 1. Rust is a brown substance that forms on iron or steel, for example when it comes into contact with water. a decaying tractor, red with rust.
28. When a metal object rusts, it becomes covered in rust and often loses its strength. Copper nails are better than iron nails because the iron rusts.
29. Rust is sometimes used to describe things that are reddish-brown in colour. turquoise woodwork with accent colours of rust and ochre. to become covered with rust, or to make something become covered in rust.
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