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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 the thyroid gland in your neck. More than 90% of all thyroid nodules are benign (non-cancerous). Some are actually cysts filled with fluid. Almost 10% of adults will develop thyroid nodules in their lifetime. They are more common in women than in men.