The Collaborative International Dictionary of English v.0.48:

dacoit \da*coit"\ (d[.a]*koit"), n. [Hind. [dsdot]akait,
   [dsdot][=a]k[=a]yat.]
   One of a class of robbers, in India and Burma (Myanmar), who
   act in gangs and are usually armed. [Also spelled dakoit.]
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

dacoit
    n 1: a member of an armed gang of robbers [syn: dacoit,
         dakoit]