- A product of corrosion of iron
caused by a reaction with air and water. Carbon
dioxide from the air dissolves in water to form an acid solution
which attacks the iron to form iron (II) (ferrous) oxide.
This is then oxidized (see oxidation
by oxygen in the air to form reddish-brown iron (III) (ferric) oxide.
Rusting may be prevented by coating the iron with zinc,
a process called galvanizing, when
the zinc is preferentially attacked by the acid solution.
- In botany, a group of fungi that live
as parasites on many kinds of higher
plants. The rust-red color of their spores
gives them their name. Rusts are of particular concern for the damage
they do to cereal crops, such as wheat and barley, and to several fruits
and vegetables. They have complex life cycles that involve growth on
more than one host plant.