(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). hourglass. Retrieved September 24, 2026, from http://smartdefine.org/hourglass/definitions/2017539 |
| Chicago | Webster's. 2011. "hourglass" http://smartdefine.org/hourglass/definitions/2017539 (accessed September 24, 2026). |
| Harvard | Webster's 2011, hourglass, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/hourglass/definitions/2017539>. |
| MLA | Webster's. "hourglass" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/hourglass/definitions/2017539> |