Real Dictionary

billiards
uncountable noun: Billiards is a game played on a large table, in which you use a long stick called a cue to hit balls against each other or into pockets around the sides of the table.

billiards in American English
a game played with three hard balls on a rectangular table covered with cloth, esp. baize, and having raised, cushioned edges: a long, tapering stick (called a cue) is used to hit and move the balls
noun: any of several games played with hard balls of ivory or of a similar material that are driven with a cue on a cloth-covered table enclosed by a raised rim of rubber, esp. a game played with a cue ball and two object balls on a table without pockets

billiards in British English
any of various games in which long cues are used to drive balls now made of composition or plastic. It is played on a rectangular table covered with a smooth tight-fitting cloth and having raised cushioned edges