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nodule
noun
- a small knot or irregular, rounded lump
- Anat. a small node
- Bot. a small knot or joint on a stem or root, esp. one containing nitrogen-fixing bacteria
- Geol.
- a small, hard lump or mass of a mineral or rock that is embedded in a larger rock
- a usually small, roundish lump or mass of manganese, cobalt, etc. found on the floor of the sea or large lake
See nodule in American Heritage Dictionary 4
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