I was reading an article Euroland: Will the Netherlands be the next domino to fall? and got surprised by the usage of domino in the title, since it is used to mention a single piece of this game.
I had always assumed that domino is the game, while every piece of it is called domino tile.
domino. noun, plural dominoes.
1. a flat, thumbsized, rectangular block, the face of which is divided into two parts, each either blank or bearing from one to six pips or dots: 28 such pieces form a complete set.
2. dominoes, (used with a singular verb) any of various games played with such pieces, usually by matching the ends of pieces and laying the dominoes down in lines and angular patterns.
So both definitions seem to be valid. However, is there any "default" meaning of it or will it be determined by the context?