Nodule

Nodule may refer to:

Nodule (geology), a small knobbly rock or mineral cluster, such as a manganese nodule
Nodule (medicine), a small aggregation of cells
Nodule (dermatology), a lesion similar to a papule
Root nodule, an outgrowth formed on the roots of legumes to house symbiotic bacteria that fix atmospheric nitrogen for the plant
A feature of mollusc sculpture.

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