The Collaborative International Dictionary of English v.0.48:

drosky \dros"ky\ (dr[o^]s"k[y^]), n.; pl. Droskies
   (dr[o^]s"k[i^]z). [Russ. drojki, dim. of drogi a kind of
   carriage, prop. pl. of droga shaft or pole of a carriage.]
   A low, four-wheeled, open carriage, formerly used in Poland
   and Russia, consisting of a kind of long, narrow bench, on
   which the passengers ride as on a saddle, with their feet
   reaching nearly to the ground. Other kinds of vehicles have
   been so called, esp. a kind of victoria drawn by one or two
   horses, and used as a public carriage in German cities.
   [Written also droitzschka, droshky and droschke.]
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

drosky
    n 1: an open horse-drawn carriage with four wheels; formerly
         used in Poland and Russia [syn: droshky, drosky]