Definition of cluster

Two or more object balls that are touching or are close together.

24 Random Essential Billiards Terms

This is the act of disturbing you opponents good looking balls in the hope that they might move over and help you out in the game of one pocket.
This is a term used in slang to reference the bridge tool.
A players skill level, ball advantage or match advantage when using a handicapping system.
Describing a difficult pot: "the awkward cueing makes this shot missable."
Also split shot. In pool, a type of shot in which two object balls are initially contacted by the cue ball simultaneously or so close to simultaneously as for the difference to be indistinguishable to the eye. In most sets of rules it is a foul if the split is one in which one of the object balls is a (or the only) legal target (ball-on) and the other is not; however, such a split is commonly considered a legal shot in informal bar pool in many areas if it is called as a split and does appear to strike the balls simultaneously).
Also yellow(s).
In snooker, the lowest-value colour ball on the table, being worth two points. It is one of the baulk colours.
In blackball, one of two groups of seven object balls that must be potted before the eight ball; compare stripes; contrast red ball.
A Carom game with lines drawn to form rectangles that restrict play and reduce the potential for high runs.
A bank shot is when the shooter (player) bounces the cue ball or the object ball (after it is hit by the cue ball) off a rail in an attempt to make the shot. A successful bank shot will result in sinking the object ball or a defense that will make it very difficult for the opponent to attempt their shot.
(noun) An opening in a table, cut partly into the bed and partly into the rails and their cushions, into which balls are shot (pocketed or potted).
(verb) Send a ball into a pocket, usually intentionally.
0-2 Barbecue is a slang billiard term that refers to a single player loosing the first 2 matches in a double elimination tournament. This double loss results in that player being knocked out of the tournament without winning even one game.
A cue dedicated to jumping balls; usually shorter and lighter than a playing cue and having a wider, hard tip. Also referred to as a jump stick.
Also (chiefly British) programme. Short for shot program. The enumerated trick shots that must be performed in the fields of artistic billiards (70 pre-determined shots) and artistic pool (56 tricks in 8 "disciplines").
The Higher Education Snooker and Pool Council is a voluntary, not-for-profit organisation established to promote cue sports in institutions of higher education on the island of Ireland.
This is an imaginary line that separates the halves of the table by crossing at the middle of the side of pockets.
A player who during the course of a tournament does not lose focus. Typically said of those players that regularly make it to the finals of a tournament.
A denigrating slang term for the mechanical bridge.
A shot in which the cue ball is potted after caroming off another ball. In snooker and most pool games doing this would be a fault (foul), but the move will score points in many games in which hazards (as such) apply, such as English billiards, or in the final or game point in Cowboy pool. The term derives from this hazard costing the player points in early forms of billiards.
Chiefly British: bank shot played up and down the longer length of the table off a short rail and into a corner pocket, as opposed to the more common bank across the short length into a center pocket or corner.
In eight-ball, when all object balls are balls-on for either player.
A description of a break shot in which the rack (pack) is spread apart well. See also the open break requirement in some games' rules, including eight-ball and nine-ball.
In carom billiards, descriptive of play in which the balls are not gathered.
When the object ball lies behind another ball which makes it impossible to be struck by the cue with a direct hit.
This is a table that offers poor conditions for play; it is either dirty, wet, or overall poor quality.
Playing an opponent for money who has no chance of winning based on disparity of skill levels. The term robbed is also sometimes used humorously in exclamations when a shot that looks like it would work did not, as in "Oh! You got robbed on that one!"
Same as cloth (deprecated; it is factually incorrect).
This is a timing device for monitoring and restricting shot times for a player.