An instrument for measuring time by the running of sand. See Hourglass.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
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.
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An instrument for measuring time by the running of sand. See Hourglass.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
Their definitions overlap or refer to similar ideas. Use these to widen your search, then compare the exact meanings.
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