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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.
Most commonly, these cancerous nodules will be a specific type of thyroid cancer derived from the thyroid gland itself; hence they are referred to as primary thyroid tumors. Less frequently, a nodule may represent spread of cancer from elsewhere in the body (metastatic or secondary cancer).