Webster's English Dictionary

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robot

ro.bot \'ro--.ba:t, -b*t\ \-.iz-*m\ n [Czech, fr. robota work; akin to OHG 
   arabeit trouble, L orbus] orphaned - more at ORPHAN 1: a machine in the 
   form of a human being that performs the mechanical func tions of a human 
   being but lacks sensitivity 2: an automatic apparatus or device that 
   performs functions ordinarily ascr ibed to human beings or operates with 
   what appears to be almost human intelligence 3: a mechanism guided by 
   automatic controls  - ro.bot.ism n