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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.
Thyroid nodules are very common. A nodule is a swelling or lump, which can be a solid or. liquid filled cyst or mass. Most are benign, but a small percentage can be cancerous. So you should always have a nodule evaluated by your physician as soon as you notice it.