Noun

(en-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.

(politics) A country that is expected to react to events in a neighboring country, according to the domino effect

A masquerade costume consisting of a hooded robe and a mask covering the upper part of the face.

* 1749 , Henry Fielding, Tom Jones , Folio Society 1973, p. 485:

all the women were desirous of having the bundle immediately opened; which operation was at length performed by little Betsy, with the consent of Mr Jones: and the contents were found to be a domino , a mask, and a masquerade ticket.

* 1983 , (Lawrence Durrell), Sebastian'', Faber & Faber 2004 (''Avignon Quintet ), p. 1007:

Then he hunted for the black carnival domino , supposing that it was the appropriate thing for a penitent to wear.

The mask itself.

* {{quote-book

, year=1872 , year_published=2009 , edition=HTML , editor= , author=James De Mille , title=The Cryptogram , chapter= citation , genre= , publisher=The Gutenberg Project , isbn= , page= , passage=He wore a domino , but beneath it could be seen his whiskers, cut after the English fashion, and long and pendent. }}

The person wearing the costume.

(geometry) A polyomino made up of two squares.