Definition of "Domino" :

noun: a small rectangular block used in playing the game of dominoes; the face of each block has two equal areas that can bear 0 to 6 dots

noun: a mask covering the upper part of the face but with holes for the eyes

noun: a loose hooded cloak worn with a half mask as part of a masquerade costume

noun: United States rhythm and blues pianist and singer and composer (born in 1928)