A light to medium brown colour.
The dried and partially fermented fatty seeds of the cacao tree from which chocolate is made.
A serving of this drink.
An unsweetened brown powder made from roasted, ground cocoa beans, used in making chocolate, and in cooking.
A hot drink made with milk, cocoa powder, and sugar.
Of a light to medium brown colour, like that of cocoa powder.
A reddish-brown color.
A similar substance based on another metal (usually with qualification, such as "copper rust").
A disease of plants caused by a reddish-brown fungus.
Damage caused to stamps and album pages by a fungal infection.
The deteriorated state of iron or steel as a result of moisture and oxidation.
To (cause to) degenerate in idleness; to make or become dull or impaired by inaction.
To oxidize, especially of iron or steel.
To cause to oxidize.
To be affected with the parasitic fungus called rust.
Of a black cat or its fur, to turn rust-coloured following long periods of exposure to sunlight.