clepsydra definition

  • noun:
    • an old product that assessed time by establishing the regulated flow of liquid through a small opening. Also referred to as water-glass.
    • A water time clock, specially as used in the old globe.
    • A water clock; a contrivance for calculating time by the graduated circulation of a liquid, since water, through a tiny aperture. See Illust. in appendix.
    • A device for measuring time by the quantity of liquid discharged from a vessel through a tiny aperture, the amount discharged in a given device of the time, as an hour or so, becoming very first determined.
    • A chemical vessel.
    • [capitalized] [NL.] In zoology, a genus of mollusks; the watering-pot shells: today called Aspergillum.
    • clock that measures time by the escape of water

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