Dictionary

noxious

adjective nox·ious \ˈnäk-shəs\

: harmful to living things

Full Definition of NOXIOUS

1
a :  physically harmful or destructive to living beings <noxious waste>
b :  constituting a harmful influence on mind or behavior; especially :  morally corrupting <noxious doctrines>
2
nox·ious·ly adverb
nox·ious·ness noun
ADVERTISEMENT

Examples of NOXIOUS

  1. <mixing bleach and ammonia can cause noxious fumes that can seriously harm you>
  2. <noxious smog that for years has been encrusting the historic cathedral with soot>

Origin of NOXIOUS

Middle English noxius, from Latin, from noxa harm; akin to Latin nocēre to harm, nec-, nex violent death, Greek nekros dead body
First Known Use: 15th century

Synonym Discussion of NOXIOUS

pernicious, baneful, noxious, deleterious, detrimental mean exceedingly harmful. pernicious implies irreparable harm done through evil or insidious corrupting or undermining <the claim that pornography has a pernicious effect on society>. baneful implies injury through poisoning or destroying <the baneful notion that discipline destroys creativity>. noxious applies to what is both offensive and injurious to the health of a body or mind <noxious chemical fumes>. deleterious applies to what has an often unsuspected harmful effect <a diet found to have deleterious effects>. detrimental implies obvious harmfulness to something specified <the detrimental effects of excessive drinking>.

Other Ecology Terms

Malthusian, anthropogenic, biomass, carbon footprint, crepuscular, niche, sere, symbiosis, taiga, tundra
NOXIOUS Defined for Kids

noxious

adjective nox·ious \ˈnäk-shəs\

Definition of NOXIOUS for Kids

:  causing harm <noxious fumes>
Medical Dictionary

noxious

adjective nox·ious \ˈnäk-shəs\

Medical Definition of NOXIOUS

:  physically harmful or destructive to living beings <noxious wastes>

Browse

Next Word in the Dictionary: noyadePrevious Word in the Dictionary: noxal surrenderAll Words Near: noxious
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears