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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.
by Mary Shomon. If your doctor has diagnosed you as having a thyroid nodule, a thyroid lump or an enlargement of the thyroid known as goiter, you'll want to know more about the diagnosis and treatment process, the relationship between nodules to thyroid cancer, and followup. What is a Thyroid Nodule? 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.