Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small knotlike protuberance.
  • n. Anatomy A small mass of tissue or aggregation of cells.
  • n. Botany A small knoblike outgrowth, as those found on the roots of many leguminous plants.
  • n. Mineralogy A small rounded lump of a mineral or mixture of minerals, usually harder than the surrounding rock or sediment.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rounded mass or irregular shape; a little knot or lump.

from the GNU version of the Collaborative International Dictionary of English

  • n. A rounded mass or irregular shape; a little knot or lump.

from The Century Dictionary and Cyclopedia

  • n. A little knot or lump.
  • n. The peculiar knot upon the roots of leguminous and a few other plants, caused by bacteria. (See nodule-bacteria, under bacterium.) They enable the plant to use atmospheric nitrogen. See root-tubercle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a small node
  • n. small rounded wartlike protuberance on a plant
  • n. (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)

Etymologies

Middle English, from Latin nōdulus, diminutive of nōdus, knot; see ned- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin nodulus ("small knot") (Wiktionary)

Examples

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