domino

1. (dominoes) A tile divided into two squares, each having 0 to 6 (or sometimes more) dots or pips (as in dice), used in the game of dominoes.Examples: "Dominoes of indiscretions down Falling all around, in cycles, in circles Constantly consuming Conquer and devour"; "The Mormon church's past anti-gay positions and its role in financing Proposition 8 – California's 2008 ban on same-sex marriage – may have been the first dominoes to fall around the faithful, but vetting Mitt Romney as a presidential candidate links the straightforward similarities between Mormonophobia and homophobia."

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

3. (geometry) A polyomino made up of two squares.Synonyms: 2-omino

4. (music, colloquial) A mistake in performing.Examples: "Any player is liable to make a 'domino' — that is to say, he goes wool-gathering and continues to play when everyone else has stopped. If he does so at a grown-up concert the fault is irredeemable […]"colloquial

5. (slang, in the plural) A person's teeth.Examples: "[…] break your dominoes by grinding them that way."; "Look here, you chaps, don't you chew it too quick, or you'll break your dominoes on the nails!"in-pluralslang