• noun:   any of various fungi causing rust disease in plants
• noun:   the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
• noun:   a reddish-brown discoloration of leaves and stems caused by a rust fungus
• noun:   a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture
• verb:   become coated with oxide
• verb:   become destroyed by water, air, or an etching chemical such as an acid

  Example: "The pipes rusted"

• verb:   cause to deteriorate due to the action of water, air, or an acid

  Example: "The steady dripping of water rusted the metal stopper in the sink"

• adjective:   of the color of rust
• name:  A surname (rare: 1 in 25000 families; popularity rank in the U.S.: #3101)

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