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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 Diseases. Nodules: Testing and Possible Results. A thyroid nodule is a lump in the thyroid gland that stands out from the rest of the gland. Most thyroid nodules are detected when the doctor feels the thyroid gland as part of a physical examination. Some thyroid nodules are only discovered when the patient has a cat scan of the chest or an ultrasound of the neck.