资料来源 : pyDict

传染性的,会蔓延的,会传播的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Contagious \Con*ta"gious\, a. [L. contagiosus: cf. F.
   contagieux.]
   1. (Med.) Communicable by contact, by a virus, or by a bodily
      exhalation; catching; as, a contagious disease.

   2. Conveying or generating disease; pestilential; poisonous;
      as, contagious air.

   3. Spreading or communicable from one to another; exciting
      similar emotions or conduct in others.

            His genius rendered his courage more contagious.
                                                  --Wirt.

            The spirit of imitation is contagious. --Ames.

   Syn: {Contagious}, {Infectious}.

   Usage: These words have been used in very diverse senses;
          but, in general, a contagious disease has been
          considered as one which is caught from another by
          contact, by the breath, by bodily effluvia, etc.;
          while an infectious disease supposes some entirely
          different cause acting by a hidden influence, like the
          miasma of prison ships, of marshes, etc., infecting
          the system with disease. ``This distinction, though
          not universally admitted by medical men, as to the
          literal meaning of the words, certainly applies to
          them in their figurative use. Thus we speak of the
          contagious influence of evil associates; their
          contagion of bad example, the contagion of fear, etc.,
          when we refer to transmission by proximity or contact.
          On the other hand, we speak of infection by bad
          principles, etc., when we consider anything as
          diffused by some hidden influence.

资料来源 : WordNet®

contagious
     adj 1: of or relating to communicable diseases; "by the road to the
            contagious hospital"
     2: easily diffused or spread as from one person to another; "a
        contagious grin"
     3: (of disease) capable of being transmitted by infection [syn:
         {catching}, {communicable}, {contractable}, {transmissible},
         {transmittable}]