What is the X in X-mas?
1801, from French domino (1771), perhaps (on comparison of the black tiles of the game) from the meaning "hood with a cloak worn by canons or priests" (1690s), from Latin dominus "lord, master" (see domain), but the connection is not clear. Klein thinks it might be directly from dominus, "because he who has first disposed his pieces becomes 'the master.' " Metaphoric use in geopolitics is from April 1954, first used by U.S. President Eisenhower in a "New York Times" piece, in reference to what happens when you set up a row of dominos and knock the first one down.
simple gambling card game playable by two to eight players. The full deck of 52 cards is dealt out singly, so some hands may contain one more card than others. All players ante an agreed amount to a betting pool. In some circles anyone dealt one card fewer than others must ante an extra chip. Each player in turn, starting at the dealer's left, must play one card to the layout if legally able or otherwise must add one counter to the pool. The first player must play a 7. The next must play either the 8 or the 6 of the same suit to one long side of it or another 7 above or below it. Thereafter, each must play a card of the same suit and in unbroken sequence with one already on the table or another 7 if any are left. Sequences build up to the king in one direction and down to the ace in the other. The first player out of cards wins the pool, to which the others must add one chip for each unplayed card