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Harmful; noxious.

[From Latin nocuus, from nocēre, to harm; see nek- in Indo-European roots.]

noc′u·ous·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


rare harmful; noxious
[C17: from Latin nocuus, from nocēre to hurt]
ˈnocuously adv
ˈnocuousness n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈnɒk yu əs)

[1625–35; < Latin nocuus harmful, injurious]
noc′u•ous•ly, adv.
noc′u•ous•ness, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


- Meaning "harmful, noxious," it is based on Latin nocere, "to hurt."
See also related terms for harmful.
Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.
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References in periodicals archive ?
Presently, vaccine hesitancy stands as the major nocuous hinderance to polio eradication efforts by Pakistan's Expanded Programme on Immunisation (EPI).
Pakistan's mega cities like Karachi and Lahore are extremely in nocuous conditions.
Moreover, using the various Eurasian concepts (reference group orientation, symbolic interaction, humanism, looking glass self, et cetera) for framing has been more nocuous for the field than upraising.
His expression was fathomable nocuous and nocent-here was a man determined to go away full-handed.
During the operative procedures, the endodontist must avoid and prevent these nocuous events, since intra-operative accidents are risk factors that may result in failure of root canal treatment.
In both plays, plague is a force that affects both tactile and olfactory senses; to connect a play to plague is to connect it to the rhetoric "of lost breaths, foul smells, and purged airs [that] channel contemporary fears of the nocuous effects of aggressive social conflict, developing within the deteriorating sanitary and social climate of a volatile and overcrowded city, not unlike Jacobean London" (161).
In it the philosopher refers to critical and widespread views on radicalism as the alleged source of all evil, absurd and nocuous ideas, and destructive machinations that the British public--gripped by fearsome images of the bloody revolution in France--was willing to attribute to the English radicals.
Selye, "A syndrome produced by diverse nocuous agents," Journal of Neuropsychiatry and Clinical Neurosciences, vol.