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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.
2 a nodule, especially an elevation of the skin that is larger than a papule, such as Morgagni's tubercles of the areolae of the breasts. 3 a small rounded nodule produced by infection with Mycobacterium tuberculosis, consisting of a gray translucent mass of small spheric cells surrounded by connective cells. tubercle