del·e·te·ri·ous

[del-i-teer-ee-uhs]
adjective
1.
injurious to health: deleterious gases.
2.
harmful; injurious: deleterious influences.

Origin:
1635–45; < Greek dēlētḗrios destructive, adj. derivative of dēlētḗr destroyer, equivalent to dēlē- variant stem of dēleîsthai to hurt, injure + -tēr agent suffix + -ios adj. suffix; see -ious

del·e·te·ri·ous·ly, adverb
del·e·te·ri·ous·ness, noun
non·del·e·te·ri·ous, adjective
non·del·e·te·ri·ous·ly, adverb
non·del·e·te·ri·ous·ness, noun
un·del·e·te·ri·ous, adjective
un·del·e·te·ri·ous·ly, adverb
un·del·e·te·ri·ous·ness, noun


2. pernicious, hurtful, destructive; noxious.


2. beneficial.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
deleterious (ˌdɛlɪˈtɪərɪəs) [Click for IPA pronunciation guide]
 
adj
harmful; injurious; hurtful
 
[C17: from New Latin dēlētērius, from Greek dēlētērios injurious, destructive, from dēleisthai to hurt]
 
dele'teriously
 
adv
 
dele'teriousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

deleterious
1640s, from Gk. deleterios, from deleter "destroyer," from deleisthai "to hurt, injure."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deleterious del·e·te·ri·ous (děl'ĭ-tēr'ē-əs)
adj.
Having a harmful effect; injurious.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Over time, this had a deleterious effect on quality.
In fact, there is increasing evidence that excessive intake of certain
  micronutrients is deleterious.
Unlike the other copy, when it experiences random mutation events, they're not
  deleterious to the organism.
There is little doubt that lack of coverage was deleterious to their health.
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