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nodule - (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment) mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them.
A:Lung nodules are solitary pulmonary nodule or lump in the lungs which usually signify cancer. If these are discovered on time, the cancer can be stopped in its tracks. Mostly lung nodules appear as scars or spots on the lungs of a certain size.