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Linguistic Note on Domino
The singular of dominoes is domino.
Note that in the field of recreational mathematics, the term domino may in fact be used just for the $2$-by-$1$ oblong shape, in its context of being two squares joined together by an edge.
An older meaning of the word domino is a carnival costume featuring a black robe and a mask, often white, that covers the eyes.
It is supposed that the name of the game dominoes may have derived from the carnival costume meaning.