Webster's English Dictionary

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domino

dom.i.no \'da:m-*-.no-\ n or dominoes or dominos [F, prob. fr. L (in the 
   ritual formula benedicamus Domino let us bless th] [F, fr. It] pl e Lord) 
   1: a long loose hooded cloak usu. worn with a half mask as a masquerade cos 
   tume 2: a half mask won with a masquerade costume  3: a person wearing a 
   domino  4a: a flat rectangular block (as of wood or plastic) the face of 
   which is d ivided into two equal parts that are blank or bear from one to 
   usu. six dots arranged as on dice faces pl but usu sing in constr  4b: any 
   of several games played with a set of usu. 28 dominoes