domino

from The Century Dictionary.

• noun An ecclesiastical garment worn over other vestments in cold weather, made loose, and furnished with a hood.
• noun By restriction, the hood alone.
• noun A garment made in partial imitation of that described in def. , and used at masked balls. It is usually made of thin silk, loose, and with large sleeves and a hood.
• noun A person wearing a domino.
• noun A half-mask formerly worn over the face by ladies when traveling, at masquerades, etc., as a partial disguise for the features.
• noun One of the pieces with which the game of dominoes is played. See def. 6.
• noun plural A game regularly played with twenty-eight flat oblong pieces of ivory, bone, or wood, usually black on one side, the back, and white on the other, the face, the latter being divided into two parts by a cross-line.

from the GNU version of the Collaborative International Dictionary of English.

• noun A kind of hood worn by the canons of a cathedral church; a sort of amice.
• noun A mourning veil formerly worn by women.
• noun A kind of mask; particularly, a half mask worn at masquerades, to conceal the upper part of the face. Dominos were formerly worn by ladies in traveling.
• noun A costume worn as a disguise at masquerades, consisting of a robe with a hood adjustable at pleasure.
• noun A person wearing a domino.
• noun A game played by two or more persons, with twenty-eight pieces of wood, bone, or ivory, of a flat, oblong shape, plain at the back, but on the face divided by a line in the middle, and either left blank or variously dotted after the manner of dice. The game is played by matching the spots or the blank of an unmatched half of a domino already played.
• noun One of the pieces with which the game of dominoes is played.
• noun To fall sequentially, as when one object in a line, by falling against the next object, causes it in turn to fall, and that second object causes a third to fall, etc.; the process can be repeated an indefinite number of times.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun games A tile divided into two squares, each having 0 to 6 dots or pips (as in dice), used in the game of dominoes.
• noun politics A country that is expected to react to events in a neighboring country, according to the domino effect
• noun A masquerade costume consisting of a hooded robe and a mask covering the upper part of the face.
• noun The mask itself.
• noun The person wearing the costume.
• noun geometry A polyomino made up of two squares.
• verb intransitive To collapse in the manner of dominoes.
• verb transitive To cause to collapse in the manner of dominoes.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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