sandglass

Noun
  1. Timepiece in which the passage of time is indicated by the flow of sand from one transparent container to another through a narrow passage (synset 104141715)
    is a type of: horologe, timekeeper, timepiece - a measuring instrument or device for keeping time
    subtypes:
    • egg timer - a sandglass that runs for three minutes; used to time the boiling of eggs
    • hourglass - a sandglass that runs for sixty minutes

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