nodule
noun
[ ˈnɒdjuːl ]
• a small swelling or aggregation of cells in the body, especially an abnormal one.
• "the area feels firm but has irregular nodules which can be painful to touch"
• a small rounded lump of matter distinct from its surroundings, e.g. of flint in chalk, carbon in cast iron, or a mineral on the seabed.
• "flint nodules"
Origin:
late Middle English: from Latin nodulus, diminutive of nodus ‘knot’.
