Definition of key ball

The object ball involved in a key shot.

24 Random Essential Billiards Terms

In the UK, one of the two pockets one either side of a pool, snooker or English billiards table halfway up the long rails.
This is a match where a player must win so many games more than the other player in order to win the match.
A British term (especially in snooker) for the splitting of a group of balls when another ball is sent into them, typically with the intent of deliberately moving them with the cue ball to develop them.
When the object ball banked of a rail goes directly in a pocket without kissing or touching any other object balls.
Also (chiefly British) shot programme. 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").
(Chiefly British.) In snooker and blackball/eight-ball pool, an instance where the cue ball has been potted (pocketed) after contacting an object ball. It is a fault (foul) in most games. There is no equivalent (current) American term for this specific means of pocketing the white ball. Compare losing hazard, scratch.
In pool, the degree to which racked balls move apart upon impact by the cue ball as a result of a break shot.
In snooker, a shot sending the cue ball into the pack of red balls and separating them (after potting the ball-on). At least one split is usually necessary in each frame, since the original triangle of reds does not allow any balls to be potted reliably.
One of the alternating turns players (or doubles teams) are allowed at the table, before a shot is played that concedes a visit to his/her opponent (e.g. "he ran out in one visit"). Usually synonymous with inning as applied to a single player/team, except in scotch doubles format.
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.
Artistic pool is a trick shot competition, inspired by the related discipline of artistic billiards.
In snooker, the cushion opposite the top cushion and bounded by the yellow and green pockets (i.e. same as bottom cushion).
A Baulk line is line drawn across the table 29 inches from the bottom cushion and parallel to that cushion.
A set of paired balls in the game of cribbage pool that have a number value which combined equal 15. For example, the 8 ball and the 7 ball added together equal 15 and thus constitute one cribbage if pocketed in succession.
A shooter's body position and posture during a shot.
In snooker, any of the three colour balls that get spotted on the baulk line: the yellow, green or brown ball.
To play for money and lull a victim into thinking they can win, prompting them to accept higher and higher stakes, until beating them and walking off with more money than they would have been willing to bet had they been beaten soundly in the beginning. The terms hustler, for one who hustles, and hustling, describing the act, are just as common if not more so than this verb form.
Chiefly British: The cushion on the top rail. Compare foot cushion; contrast bottom cushion.
White talcum powder placed on a player's bridge hand to reduce moisture so that a cue's shaft can slide more easily. It is not provided in many establishments as many recreational players will use far more than is necessary and transfer it all over the table's surface. Venues that do provide it usually do so in the form of compress cones about 6-inches tall. Some serious players bring their own, in a bottle or a porous bag that can be patted on the bridge hand. Many players prefer a pool glove. Talc is frequently mistakenly referred to as "hand chalk", despite not being made of chalk.
This is another name for One Pocket pool.

An attempt of a legal clean shot (not a slop shot) that goes badly wrong due to improper stroke, stance, table position or table conditions in which the result of the shot is completely unexpected and not what was predicted at all.

When two objects balls are lined up so that you aim to pocket the nearest object ball, the second object ball will pocket. "That was an easy combination shot, the six ball was wired to the four ball". Also wired combination/combo, wired kiss.
A player who was playing very well but suddenly starts playing badly. e.g. "He was making everything on every shot, then lost his stroke and couldn't hit anything, costing him the match."
This is a series of angled rails present within some pool tables that directs pocketed balls to a central location on the table for retrieval after the game.
This is a shot on the cue ball that will push through to a frozen ball on the cue ball. If the contact is made on the object ball while the cue stick is still contacting, essentially pushing the second ball, then it is usually considered a foul.