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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 lung nodule is a spot at least two centimeters in diameter that appears on an X-ray of the lung. Spots that are smaller than one centimeter often canât be seen on a chest X-ray. Spots that are more than two centimeters are considered a mass, not a nodule.