Definition of Hanger

A British term describing when a ball is tight on the cushion and a player sends the cue ball to hit both the object ball and the rail at nearly the same time; the object ball, ideally, stays tight to the rail and is thus "velcroed" to the rail. Inside english is often employed to achieve this effect, hitting slightly before the ball. The movement of a ball just next to the rail (but not the shot described to achieve this movement) is called hugging the rail in both the UK and the US.

Chiefly American: Also known as side spin, english (which is usually not capitalized) is spin placed on the cue ball when hit with the cue tip to the left or right of the ball's center. English has a marked effect on cue ball rebound angle off cushions (though not off object balls), and is thus crucial for gaining shape; and can be used to "throw" an object ball slightly off its otherwise expected trajectory, to cheat the pocket, and for other effects. "English" is sometimes used more inclusively, to colloquially also refer to follow and draw. In combination one could say bottom-right english, or like the face of a clock (4 o'clock english). The British and Irish do not use this term, instead preferring "side".

This is the imaginary line that a ball would need to follow in order for it to result in an effective bank shot.

Also known as back spin, a type of spin applied to the cue ball by hitting it below its equator, causing it to spin backwards even as it slides forward on the cloth. Back spin slows the cue ball down, reduces its travel, and narrows both the carom angle after contact with an object ball, and angle of reflection off a cushion. There are several variant terms for this, including "bottom" and "bottom spin" in the US and "screw" in the UK. Draw is thought to be the first spin technique understood by billiards players prior to the introduction of leather tips, and was in use by the 1790s.

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 your pocket for sinking balls in a one pocket game.

When a player is playing flawlessly, just "cannot miss" and the game seems effortless.

This is a shot where the cue ball follows directly behind the sunk object ball into the pocket right after it falls.

In snooker, the highest-value colour ball on the table, being worth seven points. In some (especially American) snooker ball sets it is numbered "7" on its surface.
The black ball (usually numbered "8") in the eight-ball variant game blackball (and its variants); also the common British term for the slightly larger but otherwise identical 8 ball in a kelly pool set (a.k.a. American or WPA pool set).

A low hit on the cue ball (but not as low as normal draw), often used to change the cue ball's angle of deflection off the object ball.

Also known as a "power draw", means applying very powerful draw on the cue ball thereby causing the maximum amount of draw.

A combination shot, where hitting the first ball rubs it against the center connecting line of two frozen object balls throwing the second out.

The motion of the cue stick and the player's arm on a shot;
The strength, fluidity and finesse of a player's shooting technique; "she has a good stroke."
A combination of finesse, good judgement, accuracy and confidence.

When the rules of the opening break are broken. Ex: If not enough balls contact with rails off the break.

This is a fine powdery substance used to assist the sliding of the cue over the hand bridge.

This is when you strike a cue ball off center to gain control on the movement on the cue ball.

Same as triple.

Same as duck. Derives from an easily shot ball "hanging" in the pocket.

Failure to hit an object ball at all with the cue ball. In most sets of rules, this is a foul like any other. However, in some variants of bar pool a table scratch while shooting for the 8 ball is a loss of game where other more minor fouls might not be, as is scratching on the 8 ball (neither result in a loss of game in most professional rules).
By way of drift from the above definition, the term is also applied by many league players to the foul in more standardized rules of failing to drive a (any) ball to a cushion, or to pocket a legal object ball, after the cue ball's initial contact with an object ball.
By way of entirely different derivation ("scratch off the table"), it can also mean knocking the cue ball (or more loosely, any ball) completely off the table.

A very thin cut shot in which the cue ball just brushes the edge of an object ball. "Feather" by itself can be both noun and verb (e.g. "feathering the ball").

In snooker, the second-highest value colour ball, being worth six points.

The precise center of the pool table.

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.

The normal phenomenon where the object ball is pushed in a direction very slightly off the pure contact angle between the two balls. Caused by the friction imparted by the first ball sliding past or rotating against the other ball.