- a small node, knot, or knob.
- a small, rounded mass or lump.
- Botany. a tubercle.
Origin of nodule
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for nodule
The size of the fish evidently regulated that of the nodule.The Cruise of the Betsey
Fig. 9 is from Northern Ohio, and is carved from a nodule of iron ore.Art in Shell of the Ancient Americans
William H. Holmes
The gland, which is seen as a nodule, is drawn forward with forceps.
Nature's method of repair was a hypertrophy of the subintimal connective tissue and the formation of a nodule at that point.Arteriosclerosis and Hypertension:
Louis Marshall Warfield
The first of these cartilages articulates with a nodule situated a little above the middle of the first bone of the sternum.Artistic Anatomy of Animals
- a small knot, lump, or node
- Also called: root nodule any of the knoblike outgrowths on the roots of clover and many other legumes: contain bacteria involved in nitrogen fixation
- anatomy any small node or knoblike protuberance
- a small rounded lump of rock or mineral substance, esp in a matrix of different rock material
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
- A small node.
- A small mass of tissue or aggregation of cells.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.