sandglass
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1.
an instrument for measuring the passage of time by the passage of sand through a narrow opening.
from Wiktionary, Creative Commons Attribution/Share-Alike License
1.
an instrument for measuring time by the running of sand. see hourglass.
from the GNU version of the Collaborative International Dictionary of English
1.
A glass vessel consisting of two equal, nearly conical, and coaxial receptacles connected by a small opening at their vertices, one of which contains sand, which, if the glass is turned, runs through the opening into the other, the amount of sand being so regulated that a certain space of time is exactly measured by its running through. compare hour-glass, minute-glass.
from The Century Dictionary and Cyclopedia