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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.
An inflammatory nodule, caused by chronic inflammation of the thyroid, is one common type of nodule. Colloid nodules are another kind of nodule that may be seen in patients presenting with this type of thyroid mass. These overgrowths of tissue may become large, but do not grow past the area of the thyroid.