noun

• (now rare) A mischievous or hostile spirit.
  "William Tyndale allotted this character a role, of leading nocturnal travellers astray as the puck had been said to do since Anglo-Saxon times and the goblin since the later medieval period."
• (mythology, literature) The mischievous fairy-like creature from English folklore, like Puck from Shakespeare's "A Midsummer Night's Dream".

verb

• (chiefly Ireland) To hit, strike.

noun

• (ice hockey) A hard rubber disc; any other flat disc meant to be hit across a flat surface in a game.
  "In hockey a flat piece of rubber, say four inches long by three wide and about an inch thick, called a ‘puck’, is used."
• (chiefly Canada) An object shaped like a puck.
  "He reaches into the urinal and picks up the puck. He then walk over to the sink and replaces a bar of soap with the urinal puck."
• (computing) A pointing device with a crosshair.
• (hurling, camogie) A penalty shot.

noun

• (Ireland, rustic) billy goat