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A 'nodule' describes an aggregation of similar cells or particles in a number of scientific fields:

★ Nodule (geology), a small knobbly rock or mineral cluster, such as a manganese nodule

★ Nodule (medicine), a small aggregation of cells

★ Root nodule, an outgrowth formed on the roots of legumes that house symbiotic bacteria that fix atmospheric nitrogen and provide it to the plant in exchange for carbon