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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 MACULE. : a patch of skin that is altered in color but usually not elevated and that is a characteristic feature of various diseases (as smallpox). ADVERTISEMENT.. : a patch of skin that is altered in color but usually not elevated and that is a characteristic feature of various diseases (as smallpox). Britannica English: Translation of macule for Arabic speakers.