Source : Webster's Revised Unabridged Dictionary (1913)

Hussar \Hus*sar"\, n. [Hung. husz['a]r, from husz twenty,
   because under King Matthais I., in the fifteenth century,
   every twenty houses were to furnish one horse soldier; cf. G.
   husar, F. houssard, hussard, from the same source.] (Mil.)
   Originally, one of the national cavalry of Hungary and
   Croatia; now, one of the light cavalry of European armies.

Source : WordNet®

hussar
     n : a member of a European light cavalry unit; renowned for
         elegant dress