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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.
2. Doesn't look like cancer. The pathologist may say that the nodule appears not to be cancer. This makes it very unlikely, though not impossible, that the nodule is a cancer. In a tiny percentage of cases, the nodule turns out to be a cancer even though the pathologist didn't see anything worrisome on the biopsy.