noun
nodule
NAH-jool/ˈnɑːdʒuːl/
A small rounded lump or mass.
A small rounded nodule grows from the side of the root.

Etymology
The pieces mean “little knot.” That image describes a small, rounded lump or growth as a knot-like formation rather than something tied with string.
In context
lung nodule that might be the biggest threat to her because she was very mentally intact
More examples
- The scan reveals a tiny nodule in his lung.
- Rounded nodules of flint dot the chalk cliff.
- Small nodules grow along the roots of the bean plant.
Forms
nodule · nodules
nodular adjective — Having or consisting of small rounded lumps.