Definition from Wiktionary, the free dictionary
- A clock made of two glass vessels connected with a narrow passage, with sand flowing through that passage.
- After each game turn, invert the hourglass to reset the time limit for the next player.
- (computing) A pointer, often shaped like an hourglass, indicating the computer is busy.
- The computer showed an hourglass mouse cursor to indicate that it was too busy to process user input.