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dom·i·no1  audio  (dm-n) KEY 

NOUN:
pl. dom·i·noes or dom·i·nos
    1. A small rectangular wood or plastic block, the face of which is divided into halves, each half being blank or marked by dots resembling those on dice.
    2. dominoes or dominos(used with a sing. or pl. verb) A game played with a set of these small blocks, generally 28 in number.
  1. A country expected to react politically to events as predicted by the domino theory: "The dominos did indeed fall in Indochina" (Arthur M. Schlesinger, Jr.).

ETYMOLOGY:
French, probably from domino, mask, perhaps because of the resemblance between the eyeholes and the spots on some of the tiles ; see domino2


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