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

  Infectious \In*fec"tious\, a. [Cf. F. infectieux.]
     [1913 Webster]
     1. Having qualities that may infect; communicable or caused
        by infection; pestilential; epidemic; as, an infectious
        fever; infectious clothing; infectious water; infectious
        vices.
        [1913 Webster]
  
              Where the infectious pestilence.      --Shak.
        [1913 Webster]
  
     2. Corrupting, or tending to corrupt or contaminate;
        vitiating; demoralizing.
        [1913 Webster]
  
              It [the court] is necessary for the polishing of
              manners . . . but it is infectious even to the best
              morals to live always in it.          --Dryden.
        [1913 Webster]
  
     3. (Law) Contaminating with illegality; exposing to seizure
        and forfeiture.
        [1913 Webster]
  
              Contraband articles are said to be of an infectious
              nature.                               --Kent.
        [1913 Webster]
  
     4. Capable of being easily diffused or spread; sympathetic;
        readily communicated; as, infectious mirth.
        [1913 Webster]
  
              The laughter was so genuine as to be infectious.
                                                    --W. Black.
  
     Syn: See Contagious.
          [1913 Webster]

From WordNet (r) 3.0 (2006) :

  infectious
      adj 1: caused by infection or capable of causing infection;
             "viruses and other infective agents"; "a carrier remains
             infective without himself showing signs of the disease"
             [syn: infectious, infective]
      2: easily spread; "fear is exceedingly infectious; children
         catch it from their elders"- Bertrand Russell [ant:
         noninfectious]
      3: of or relating to infection; "infectious hospital";
         "infectious disease"

From Moby Thesaurus II by Grady Ward, 1.0 :

  40 Moby Thesaurus words for "infectious":
     catching, communicable, contagious, deadly, destructive, endemic,
     envenomed, epidemial, epidemic, epiphytotic, epizootic, infective,
     inoculable, irresistible, malign, malignant, mephitic, miasmal,
     miasmatic, miasmic, noxious, pandemic, pestiferous, pestilent,
     pestilential, poisonous, sporadic, spreading, sympathetic, taking,
     toxic, toxicant, toxiferous, transmissible, venenate, veneniferous,
     venenous, venomous, virulent, zymotic
  
  

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