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Definition of rust:

  1. A composition used in making a rust joint. See joint, below.
  2. 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.
  3. Corrosive or injurious accretion or influence.
  4. Foul matter arising from degeneration; as, rust on salted meat.
  5. That which resembles rust in appearance or effects.
  6. 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.
  7. To be affected with the parasitic fungus called rust; also, to acquire a rusty appearance, as plants.
  8. To cause to contract rust; to corrode with rust; to affect with rust of any kind.
  9. To contract rust; to be or become oxidized.
  10. To degenerate in idleness; to become dull or impaired by inaction.
  11. To impair by time and inactivity.


decay, exhaust, corrode, stain, damage, run through, residue, brown, eat up, consume, deplete, dioxin, red, hurt, erode, wipe out, red-yellow, reddish-brown, precipitate, eat on, out of practice, rust fungus, mark, harm, rust-brown, crystal, oak apple, rot, distillate, blight, scale, become rusty, rusting, take its toll, use up, disfigure, filtrate, feed, Dutch elm disease, injure, rusty, chromatic, eat, mar, disease, degenerate, canker, hoary, spoil.

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