Source : Webster's Revised Unabridged Dictionary (1913)

Ressaldar \Res"sal*dar\ (r[e^]s"sal*d[aum]r), n. [Hind.
   ris[=a]ld[=a]r, fr. ris[=a]l[=a] troop of horse + Per. d[=a]r
   holding.] (Mil.)
   In the Anglo-Indian army, a native commander of a ressala.