Update 6 April 2009, The Definition of Rust

rust (rst)

n.

1. Any of various powdery or scaly reddish-brown or reddish-yellow hydrated ferric oxides formed on iron and iron-containing materials by low-temperature oxidation in the presence of water.

2. Any of various metallic coatings, especially oxides, formed by corrosion.

3. A stain or coating resembling iron rust.

4. Deterioration, as of ability, resulting from inactivity or neglect.

5. Botany

a. Rust fungus.

b. A plant disease caused by a rust fungus, characterized by reddish or brownish spots on leaves, stems, and other parts.

6. A strong brown.