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3 definitions found
 for deleterious
From The Collaborative International Dictionary of English v.0.48 :

  Deleterious \Del`e*te"ri*ous\, a. [LL. deleterius noxious, Gr.
     dhlhth`rios, fr. dhlei^sqai to hurt, damage; prob. akin to L.
     delere to destroy.]
     Hurtful; noxious; destructive; pernicious; as, a deleterious
     plant or quality; a deleterious example. --
     Del`e*te"ri*ous*ly, adv. -- Del`e*te"ri*ous*ness, n.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

  deleterious
      adj 1: harmful to living things; "deleterious chemical
             additives" [syn: deleterious, hurtful, injurious]

From Moby Thesaurus II by Grady Ward, 1.0 :

  46 Moby Thesaurus words for "deleterious":
     baleful, baneful, corroding, corrosive, corrupting, corruptive,
     counterproductive, damaging, deadly, destroying, destructive,
     detrimental, disadvantageous, disserviceable, distressing, harmful,
     hurtful, injurious, lethal, malefic, malevolent, malign, malignant,
     mischievous, noisome, noxious, ominous, pernicious, poisonous,
     prejudicial, ruining, ruinous, scatheful, toxic, unadvantageous,
     unfavorable, unprofitable, unrewarding, useless, venenate,
     veneniferous, venenous, venomous, vicious, virulent, worthless
  
  

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