Source : Webster's Revised Unabridged Dictionary (1913)

Variola \Va*ri"o*la\, n. [LL., fr. L. varius various. See
   {Various}.] (Med.)
   The smallpox.

Source : WordNet®

variola
     n : a highly contagious viral disease characterized by fever and
         weakness and skin eruption with pustules that form scabs
         that slough off leaving scars [syn: {smallpox}, {variola
         major}]