[ nok-shuhs ]
/ ˈnɒk ʃəs /


harmful or injurious to health or physical well-being: noxious fumes.
morally harmful; corrupting; pernicious: a noxious plan to spread dissension.

Nearby words

Origin of noxious

1605–15; < Latin noxius harmful, hurtful, injurious, equivalent to nox(a) harm, hurt, injury (akin to nocēre to do harm, inflict injury; see innocent) + -ius -ious

Related forms

nox·ious·ly, adverbnox·ious·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for noxious

British Dictionary definitions for noxious


/ (ˈnɒkʃəs) /


poisonous or harmful
harmful to the mind or morals; corrupting

Derived Forms

noxiously, adverbnoxiousness, noun

Word Origin for noxious

C17: from Latin noxius harmful, from noxa injury
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

Medicine definitions for noxious


[ nŏkshəs ]


Harmful to living things; injurious to health.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.