San·ta Claus 
(săntə klôz′)
(săntə klôz′)n.
The personification of the spirit of Christmas, usually represented as a jolly fat old man with a white beard and a red suit, who brings gifts to good children on Christmas Eve.
[Probably alteration of Dutch Sinterklaas, from Middle Dutch Sinterclaes, St. Nicholas : sint, saint (from Middle Dutch, from Old French saint; see SAINT) + heer, lord; see MYNHEER + claes (short for Niclaes, Nicholas).]