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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.
Define nodule: a small mass of rounded or irregular shape: such as; a small rounded lump of a mineral or mineral aggregate â nodule in a sentence a small mass of rounded or irregular shape: such as; a small rounded lump of a mineral or mineral aggregateâ¦ See the full definition