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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 thyroid nodule (NAHD-yool) is a swelling in one section of the thyroid gland. The nodule may be solid or filled with fluid or blood. You may have just one thyroid nodule or many. Thyroid nodules are common and affect four times as many women as men.