n.

1. 小瘤；小结
2. （藻）节；（菌）瘤
3. 【矿】结核

n.

1. a small swelling or aggregation of cells, especially an abnormal one.
   ▸ (usu. root nodule) a swelling on a root of a leguminous plant, containing nitrogen-fixing bacteria.
2. a small rounded lump of matter distinct from its surroundings.