| Noun | 1. | nodule - a small node node - any bulge or swelling of an anatomical structure or part |
| 2. | nodule - small rounded wartlike protuberance on a plantplant process, enation - a natural projection or outgrowth from a plant body or organ | |
| 3. | 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 geode - (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals |