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Origin of nodule

1590–1600; < Latin nōdulus a little knot, equivalent to nōd(us) node + -ulus -ule Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for nodule

Historical Examples of nodule

British Dictionary definitions for nodule


  1. a small knot, lump, or node
  2. Also called: root nodule any of the knoblike outgrowths on the roots of clover and many other legumes: contain bacteria involved in nitrogen fixation
  3. anatomy any small node or knoblike protuberance
  4. a small rounded lump of rock or mineral substance, esp in a matrix of different rock material
Derived Formsnodular, nodulose or nodulous, adjective

Word Origin for nodule

C17: from Latin nōdulus, from nōdus knot
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for nodule

early 15c., from Latin nodulus "small knot," diminutive of nodus "knot" (see net (n.)). Related: Nodulated; nodulous; nodulation.

Online Etymology Dictionary, © 2010 Douglas Harper

nodule in Medicine


  1. A small node.
  2. A small mass of tissue or aggregation of cells.
Related formsnodu•lar (nŏjə-lər) null null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

nodule in Science


  1. A small, usually hard mass of tissue in the body.
  2. 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.
  3. 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.