Cooler
A cooler is a hand lost not because of a mistake but rather because of the way the cards came out; a player with a strong hand loses to another player with a stronger hand. Usually, the player loses a lot of money and there was no way to avoid it with correct play.
One example of a cooler is when two players in Texas Hold'em both have a high pair and each hit their three of a kind on the flop. It's not a bad beat, just bad luck that the cards were such that correct play on the part of both players leads one to lose terribly. Both players had very strong hands.
Related Topics:
Bad Beat, Cold Deck