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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 your thyroid gland. It can be solid or filled with fluid. You can have a single nodule or a cluster of nodules. Thyroid nodules are common and rarely cancerous. Your thyroid is a small butterfly-shaped gland that is located near your larynx (voice box). Your thyroid produces two hormones and secretes them into your bloodstream.