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2 definitions found
 for Yersinia pestis
From The Collaborative International Dictionary of English v.0.48 :

  Bubonic plague \Bubonic plague\ (Med.)
     a severe and often fatal disease caused by infection with the
     bacterium Yersinia pestis (formerly Pasteurella pestis),
     transmitted to man by the bite of fleas, themselves usually
     infected by biting infected rodents. It is characterized by
     the formation of buboes, most notably on the groin and
     armpits, and accompanied by weakness and high fever. The
     disease was known as the black death, and was responsible
     for several devastating plagues throughout the middle ages.
     When lungs became infected, the disease was called the
     pneumonic plague. It is still found occasionally in poor
     areas of undeveloped countries but is rare in developed

From WordNet (r) 3.0 (2006) :

  Yersinia pestis
      n 1: a bacillus bacterium that causes the plague; aerosolized
           bacteria can be used as a bioweapon

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