n.1 a small rounded lump of anything, e.g. flint in chalk, carbon in cast iron, or a mineral on the seabed.
2 a small swelling or aggregation of cells, e.g. a small tumour, node, or ganglion, or a swelling on a root of a legume containing bacteria.
Derivatives:
nodular adj. nodulated adj. nodulation n. nodulose adj. nodulous adj.
Etymology: L nodulus dimin. of nodus: see NODUS