[ noj-ool ]
/ ˈnɒdʒ ul /


a small node, knot, or knob.
a small, rounded mass or lump.
Botany. a tubercle.



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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. 2020

Example sentences from the Web for nodule

British Dictionary definitions for nodule

/ (ˈnɒdjuːl) /


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

Derived forms of nodule

nodular, 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

Medical definitions for nodule

[ nŏjōōl ]


A small node.
A small mass of tissue or aggregation of cells.

Other words from nodule

nodu•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.

Scientific definitions for nodule

[ nŏjōōl ]

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.