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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 nodule. : a small mass of rounded or irregular shape: such asa : a small rounded lump of a mineral or mineral aggregateb : a swelling on a leguminous root that contains symbiotic bacteriac : a small abnormal knobby bodily protuberance (such as a tumorous growth or a calcification near an arthritic joint)