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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.
1. a small knot, lump, or node. 2. (Botany) Also called: root nodule any of the knoblike outgrowths on the roots of clover and many other legumes: contain bacteria involved in nitrogen fixation. 3. (Anatomy) anatomy any small node or knoblike protuberance.