Definition of scratch

1- Pocketing of the cue ball in pocket billiards. In most games, a scratch is a type of foul. "Scratch" is sometimes used to refer to all types of fouls.

2- British term/slang for Draw

24 Random Essential Billiards Terms

Artistic pool is a trick shot competition, inspired by the related discipline of artistic billiards.
Modification of the rules and/or scoring of a game to enable players of variable abilities to compete on a more even playing field. Examples of handicapping include spotting balls and giving games on the wire to an opponent. In league play, other forms of handicapping include awarding compensating points to a lesser-skilled team, or using numerical player ranking systems to adjust final scores between opponents of different skill levels.
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 when you aim at one particular object ball that is not meant to go in the pocket, but is instead meant to contact another object ball which will continue the combination process or be pocketed.
A fast paced offensive game similar to 9-ball but only using balls numbered 1 through 7.
Pocketing the 7-ball wins the game. Under the current pro rules of 7-ball, any missed shot gives your opponent ball-in-hand.
This is to direct the cue ball by barely contacting an object ball.
Deviation of a ball from its initial direction of travel. Often the result of a poor-quality table and may be an artifact of the cloth, the bed, a ball with uneven weight distribution, or simply the floor the table stands on being uneven.
This is the portion of the cue you would be holding if there was no wrap or grip present. This is the position where the best gripping power can be generated, and is situated below the forearm and above the butt. This portion is often covered with a wrap, but other times left bare to create a simple seamless style.
(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.
Chiefly American, and largely obsolete: Same as referee.
The International Pool Tour is a professional sports tour created in 2005 by Kevin Trudeau and hosted by Rebecca Grant. It aims to elevate pool (pocket billiards) to the level of other modern sports.
Sandbagging, in any handicapped sport, is the unethical practice of deliberately playing below your ability in order to alter your handicap so it does not reflect your true ability.
The angle at which a ball approaches a rail, as measured from the perpendicular to the rail.
A highly abrasive tip tool used to shape an unreasonably flat new cue tip, or misshapen old one, into a more usable, consistently curved profile, most commonly the curvature of a nickel or dime (or equivalently sized non-US/Canadian coin) for larger and smaller pool tips, respectively. Similar to a scuffer, but deeper and rougher.

1- Shortened phrase of "ball-in-hand".

2 - In snooker, the ability to place the cue ball anywhere inside the boundaries of the D. This occurs at the start of a frame, and after the cue ball has been potted or forced off the table.
Also a short form of "Ball In Hand".

A foul where the rules are blatantly, intentionally violated, with a stiffer penalty (e.g., loss of game) than normal.
A tournament format in which a player is out of the tournament after a single match loss.
A shooter's body position and posture during a shot.
This is a particular shot where the potential for a miscue is higher because of the amount of draw that is attempted on the cue ball.
This is a ball that is positioned near your pocket that can be used to kiss off of when sinking another object ball.
This describes balls that are not able to be made in a pocket, either because they are high up on the table, in a different pocket, or in a cluster that makes the shot difficult. This condition of being out of play obviously exists on different difficulty levels.
An area defined on a billiard table, in games such as pool, snooker, English billiards and bagatelle, by a single balkline (drawn or imaginary) that runs across the table near the head (bottom) end; exactly where depends upon table type and size. This balk is where the cue ball is placed in lagging for lead, for making the opening break shot, and sometimes for other purposes, depending upon the game.
Five-pin billiards is a today usually a carom but sometimes still a pocket form of cue sport, popular especially in Italy and Argentina but also in some other parts of Latin America and Europe, with international, televised professional tournaments. The game is sometimes referred to as Italian five-pins or Italian billiards.
The precise center of the pool table.