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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.
Definition of Lung Nodules. A lung nodule is defined as a âspotâ on the lung that is 3 cm (about 1 Â½ inches) in diameter or less. If an abnormality is seen on an x-ray of the lungs that is larger than 3 cm, it is considered a âlung massâ instead of a nodule, and is more likely to be cancerous.