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.
domino (Noun) — A loose hooded cloak worn with a half mask as part of a masquerade costume.
domino (Noun) — A mask covering the upper part of the face but with holes for the eyes.
domino (Noun) — United States rhythm and blues pianist and singer and composer (born in 1928).