Relating to or denoting any of various games played on a rectangular table with cues and balls. Often used as 'billiards' for the games themselves.
From French 'billard,' from 'bille' (ball) plus suffix '-ard.' The French 'bille' comes from Medieval Latin 'billa,' possibly from a Celtic source meaning 'tree trunk.'
The game evolved from lawn games played on grass (like croquet) to indoor tables, which explains why we still say 'break' and use green felt - it's mimicking the original outdoor playing surface. The precision required makes billiards both a game and a physics demonstration.
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