hourglass

1. n. An instrument for measuring time, especially the interval of an hour. It consists of a glass vessel having two compartments, from the uppermost of which a quantity of sand, water, or mercury occupies an hour in running through a small aperture unto the lower. Source: opted

2. n. a sandglass that runs for sixty minutes Source: wordnet

3. An instrument for measuring time, especially the interval of an hour. It consists of a glass vessel having two compartments, from the uppermost of which a quantity of sand, water, or mercury occupies an hour in running through a small aperture unto the lower. Note: A similar instrument measuring any other interval of time takes its name from the interval measured; as, a half-hour glass, a half- minute glass. A three-minute glass is sometimes called an egg-glass, from being used to time the boiling of eggs. Source: webster

4. An instrument for measuring time, especially the interval of anhour. It consists of a glass vessel having two compartments, from theuppermost of which a quantity of sand, water, or mercury occupies anhour in running through a small aperture unto the lower. Source: adambom

5. n:100 n. a sandglass that runs for sixty minutes Source: ecdict

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