Nodule

A small, rounded mass or lump that can occur in various contexts, including medicine, geology, and botany. In medicine, nodules are tissue growths that can be benign or malignant; in geology, they are mineral or rock formations; and in botany, they are swellings on plant roots often associated with nitrogen-fixing bacteria. Nodules are relevant to medical professionals, geologists, and botanists, each within their respective fields.