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rust

 
 
pronunciation:
ruhst
parts of speech:
noun, verb
features:
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part of speech: noun
definition 1: an orange or reddish brown coating that forms on metal that has been exposed to air and water.
The old bike had been outside in the rain for months and there was rust all over the metal.
 
definition 2: a plant disease that causes reddish brown or black spots on leaves and stems. It is caused by a fungus.
 
part of speech: verb
inflections: rusts, rusting, rusted
definition: to become rusty.
The fender of my bike is rusting.
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  fungus, water