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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 is a lump in or on the thyroid gland. Thyroid nodules are common and detected in about six percent of women and one to two percent of men; they are less common in younger patients and occur 10 times as often in older individuals, but are usually not diagnosed.