hourglasses

Example:At sea, sailors often used a sandglass to track the duration of watches.

Definition:Another term for an hourglass, a device used to measure time using the flow of sand.

Example:Despite the old-fashioned look of the hourglass, it provided an accurate timer for cooking in the oven.

Definition:A device for measuring and signaling the passage of time, which can be used in the context of hourglasses for strict timekeeping.