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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.
nodule. a small node that is solid and can be detected by touch. Albini's n's gray nodules of the size of small grains, sometimes seen on the free edges of the atrioventricular valves of infants; they are remains of fetal structures.