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[nahy-duh s] /ˈnaɪ dəs/
noun, plural nidi
[nahy-dahy] /ˈnaɪ daɪ/ (Show IPA)
a nest, especially one in which insects, spiders, etc., deposit their eggs.
a place or point in an organism where a germ or other organism can develop or breed.
Origin of nidus
1735-45; < Latin nīdus nest
Related forms
nidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for nidal


noun (pl) -di (-daɪ)
the nest in which insects or spiders deposit their eggs
(pathol) a focus of infection
a cavity in which plant spores develop
Derived Forms
nidal, adjective
Word Origin
C18: from Latin nest
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
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Word Origin and History for nidal



"nest, breeding place," 1742, from Latin nidus "a nest," from Old Latin *nizdus (see nest (n.)). Figurative use by 1807. Classical plural is nidi.

Online Etymology Dictionary, © 2010 Douglas Harper
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nidal in Medicine

nidal ni·dal (nīd'l)
Of, relating to, or characteristic of a nidus.

nidus ni·dus (nī'dəs)
n. pl. ni·dus·es or ni·di (-dī)

  1. A central point or focus of bacterial growth in a living organism.

  2. A nest, especially one for the eggs of insects, spiders, pathogenic organisms, or small animals.

  3. A cavity where spores develop.

  4. A point or place at which something originates, accumulates, or develops, as the center around which calculi form.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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