nodule definition by Webster's New World
- 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 large lake
Origin: Classical Latin nodulus, diminutive of nodus, a knot: see net
nodule definition by American Heritage Dictionary
- A small knotlike protuberance.
- Anatomy A small mass of tissue or aggregation of cells.
- Botany A small knoblike outgrowth, as those found on the roots of many leguminous plants.
- Mineralogy A small rounded lump of a mineral or mixture of minerals, usually harder than the surrounding rock or sediment.
Origin: Middle English, from Latin nōdulus, diminutive of nōdus, knot; see ned- in Indo-European roots.
- nodˈu·lar , nodˈu·loseˌ , nodˈu·lous adjective
nodule - Medical Definition
- A small node.
- A small mass of tissue or aggregation of cells.
- nodular , nodˈu·loseˌ , nodˈu·lous adjective
nodule - Science Definition
- A small, usually hard mass of tissue in the body.
- A small, knoblike outgrowth found on the roots of many legumes, such as alfalfa, beans, and peas. Nodules grow after the roots have been infected with nitrogen-fixing bacteria of the genus Rhizobium. See more at legume.
- A small, rounded lump of a mineral or mixture of minerals that is distinct from and usually harder than the surrounding rock or sediment. Nodules often form by replacement of a small part of the rocks in which they form.