- 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
- 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 a large lake
Origin of noduleClassical Latin nodulus, diminutive of nodus, a knot: see net
- A small knotlike protuberance.
- Medicine A small, abnormal but usually benign mass of tissue, as on the thyroid gland, in the lung, or under the skin.
- Botany A small knoblike outgrowth, especially one on the roots of a leguminous plant that contains bacteria that fix nitrogen.
- Mineralogy A small rounded lump of a mineral or mixture of minerals, usually harder than the surrounding rock or sediment.
Origin of noduleMiddle English from Latin nōdulus diminutive of nōdus knot ; see ned- in Indo-European roots.
- nod′u·lar nod′u·lose′ nod′u·lous
- A rounded mass or irregular shape; a little knot or lump.
From Latin nodulus (“small knot")