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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.
Top 10 unbelievable historical concurrencies. A rheumatoid nodule is a lump formed under the skin of a person with rheumatoid arthritis. The nodules are commonly located at a pressure point in the body. Typically, the nodules form at pressure points such as the elbows, fingers, heels and knuckles.