Source : Webster's Revised Unabridged Dictionary (1913)

Croupier \Crou"pi*er\ (kr??"p?-?r), n. [F.; prop., one who sits
   on the croup, and hence, in the second place; an assistant.
   See 1st {Croup}.]
   1. One who presides at a gaming table and collects the
      stakes.

   2. One who, at a public dinner party, sits at the lower end
      of the table as assistant chairman.

Source : WordNet®

croupier
     n : someone who collects and pays bets at a gaming table