Definition of blocker

This is an object ball that essentially covers up a path necessary for sinking the desired object ball.

24 Random Essential Billiards Terms

The full fifteen ball set of pool or snooker object balls after being racked, before the break shot (i.e., same as rack, definition 2, and triangle, defn. 2). Chiefly British today, but also an American usage ca. World War I.
This refers to a shot that travels on a shallower path due to the english placed on it. This is to come up on the near side of a pocket on a bank shot.
This is a carom shot that utilizes english and only two rails to achieve three cushion contacts.
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.
When a ball is in firm contact with a cushion or another ball.
Describing a situation where a pot is made more difficult, either by a pocket being partially blocked by another ball so that not all of it is available, or the cue ball path to the object ball's potting angle involves going past another ball very closely.
The point in match play where both players (or teams) need only one more game (frame) victory to win the match or race.
Adjectival expression for a player's deadly game; "watch out, he plays jam up.
The non-red colored ball meant to be pocketed in a game of snooker, or the next ball meant to be pocketed in a particular game.
A shot played slowly and with heavy draw and follow-through so that the cue ball can be struck firmly but with a lot of the pace taken out, allowing more control than just a gentle tap that would travel as far. Also called "Drag Draw".
Also striped ones, striped balls. The ball suit (group) of a fifteen ball set that are numbered 9 through 15 and have a wide colored bar around the middle. Compare bigs, highs, yellows, overs; contrast solids.
Slang term for the cue ball.
This describes a shot where you bank the object ball off of a rail and then sink it in a corner pocket.
Same as triple.
The pool player who is at the table taking their shot.
A combination shot, where hitting the first ball rubs it against the center connecting line of two frozen object balls throwing the second out.
Carambole billiards is a French billiards game involving two cue balls and a single red object ball. The purpose of carambole billiards is to obtain points by contacting the object ball and the opponent's cue ball in the same shot.
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").
A successful attempt to get out of a snooker.
A game of pool played on a table shaped like a rectangle, with or without pockets.
This is a type of shot that is executed by an object ball caroming off of another object ball in order to gain the pocket.
This is what is brought to the table if you are playing at your best potential.
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.
This playing to a number less than eight in a game of one pocket.