Source : Webster's Revised Unabridged Dictionary (1913)

Sirdar \Sir*dar"\, n.
   In Turkey, Egypt, etc., a commander in chief, esp. the one
   commanding the Anglo-Egyptian army.

Sirdar \Sir*dar"\, n. [Hind. & Per. sard[=a]r a chief, general;
   sar the head, top + d[=a]r holding, possessing.]
   A native chief in Hindostan; a headman. --Malcom.

Source : WordNet®

sirdar
     n : an important person in India