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hourglass definition

hour·glass (o̵ur′glas′)

noun

an instrument for measuring time by the trickling of sand, mercury, water, etc. through a small opening from one glass bulb to another below it, in a fixed period of time, esp. one hour

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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