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1. (Geology), a small rock or mineral cluster. (

2. (Medicine), a small aggregation of cells. (

3. A rounded mass or irregular shape; a little knot or lump. (

4. (Minerology) A small rounded lump of mineral substance (usually harder than the surrounding rock or sediment). (

5. A small lump, swelling or collection of tissue. (

Word origin: From Latin nodulus “small knot,” diminutive of nodus “knot”

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