(juggling) A type of hollow juggling ball with a hard, shiny outer shell, designed to be more visible than beanbags.

plural of stage ball

A form of pool in which players must hit with the cue ball the object ball with the lowest numerical value, but may legally pot any ball apart from the white; whichever player pots the nine ball wins the game.

(mathematics, probability theory) a Markov process is said to show detailed balance if the transition rates between each pair of states i and j in the state space obey

(figuratively) To cease participating in an activity that has turned to one's disadvantage, especially out of spite, or in a way that prevents others from participating as well.

Alternative form of Canada balsam

(topology, mathematical analysis, restricted to metric spaces) The set of all points in a metric space whose distance from a given point ("the open ball's center") is less than a given length ("the open ball's radius").

A form of handgun that fires projectiles of rubber of similar material, used mainly by law enforcement officers for riot control.

plural of flash-ball

(soccer) A forward pass played between opposition defenders.