[1] : The Collaborative International Dictionary of English v.0.48

malignant \malig"nant\, a. l. malignans, -antis, p. pr. of
   malignare, malignari, to do or make maliciously. see
   malign, and cf. benignant.
   1. disposed to do harm, inflict suffering, or cause distress;
      actuated by extreme malevolence or enmity; virulently
      inimical; bent on evil; malicious.
      1913 webster

            a malignant and a turbaned turk.      --shak.
      1913 webster

   2. characterized or caused by evil intentions; pernicious.
      "malignant care." --macaulay.
      1913 webster

            some malignant power upon my life.    --shak.
      1913 webster

            something deleterious and malignant as his touch.
                                                  --hawthorne.
      1913 webster

   3. med. tending to produce death; threatening a fatal
      issue; virulent; as, malignant diphtheria.
      1913 webster

   malignant pustule med., a very contagious disease
      produced by infection of subcutaneous tissues with the
      bacterium bacillus anthracis. it is transmitted to man
      from animals and is characterized by the formation, at the
      point of reception of the infection, of a vesicle or
      pustule which first enlarges and then breaks down into an
      unhealthy ulcer. it is marked by profound exhaustion and
      often fatal. the disease in animals is called charbon;
      in man it is called cutaneous anthrax, and formerly was
      sometimes called simply anthrax.
      1913 webster +pjc
see also:
malign benignant malignant pustule bacillus anthracis charbon cutaneous anthrax 
anthrax 

[2] : The Collaborative International Dictionary of English v.0.48

anthrax \an"thrax\ a^n"thra^ks, n. l., fr. gr. 'a`nqrax
   coal, carbuncle.
   1. med.
      a a carbuncle.
      b a malignant pustule.
          1913 webster

   2. biol. a microscopic, bacterial organism bacillus
      anthracis, resembling transparent rods. see illust.
      under bacillus.
      1913 webster

   3. an infectious disease of cattle and sheep. it is ascribed
      to the presence of a rod-shaped gram-positive bacterium
      bacillus anthracis, the spores of which constitute the
      contagious matter. it may be transmitted to man by
      inoculation. the spleen becomes greatly enlarged and
      filled with bacteria. called also splenic fever.
      1913 webster
see also:
bacillus anthracis bacillus bacillus anthracis splenic fever 

[3] : The Collaborative International Dictionary of English v.0.48

anthrax vaccine \an"thrax vac"cine\ veter.
   a fluid vaccine obtained by growing a bacterium bacillus
   anthracis, formerly bacterium anthracis in beef broth. it
   is used to immunize animals, esp. cattle.
   webster 1913 suppl.
see also:
bacillus anthracis bacterium anthracis 

[4] : WordNet (r) 2.0

bacillus anthracis
     n : a species of bacillus that causes anthrax in humans and in
         animals cattle and swine and sheep and sheep and rabbits
         and mice and guinea pigs; can be used a bioweapon syn:
         anthrax
see also:
anthrax 

Bacillus >> B Words
Bacillus, definition of term: Bacillus
bacillus_pag1.html

Bacillus Subtil >> B Words
Bacillus Subtil, definition of term: Bacillus Subtil
bacillus+subtil_pag1.html

Comma Bacillus >> C Words
Comma Bacillus, definition of term: Comma Bacillus
comma+bacillus_pag1.html