ressaldar
The native captain of an Indian cavalry regiment.
"If ye know the track of the morning-mist, ye know where his pickets are. […]
Then up and spoke Mohammed Khan, the son of the Ressaldar:
Where it comes from
From Hindustani contraction रिसालदार (risāldār) / رسالدار (risāldār), from रिसालादार (risālādār) / رسالہ دار (risāla-dār), from Persian رسالهدار (resâle-dâr), from Arabic رِسَالَة (risāla) + Persian agent suffix دار (dâr).
Adapted from the Wiktionary entry ressaldar (CC BY-SA 4.0).