water clock
noun[C]
(alsowaterclock,water-clock)uk/ˈwɔː.tə ˌklɒk/us/ˈwɑː.t̬ɚ ˌklɑːk/in the past, atypeofclockthat usedflowingwatertomeasuretime:
（旧时利用水流计时的）水钟，漏壶Thewaterclockmeasuredtimeas aresultof theforceofwaterfallingthrough it at aconstantrate.水钟通过水以恒定速率流过它的力量来测量时间。
The mostaccuratetimekeepingdevicesof theancientworldwere the waterclock or clepsydra, firstfoundin Egypt.古代世界最准确的计时装置是水钟或漏壶，最早出现在埃及。
Synonym
clepsydra
- AncientChineseastronomersusedwaterclocks, whichkepttimebydrippingwaterinto acontainerat aconstantrate.
- The limitations ofwaterclockshadlongbeenrecognizedinnorthernEurope: among otherdifficultiesthewaterusuallyfrozeinwinter.
- While neverreachingthelevelofaccuracybasedon today'sstandardsoftimekeeping, thewaterclockwas the mostaccurateandcommonlyusedtimekeepingdeviceformillennia.
- Manyhistoriansbelievethat thebuildingcontainedawaterclockthat was hydraulicallypoweredwithwaterflowingdown thesteepAcropolishill.
- Awatchof two or three men on thedecklookedafter thetrimmingof thesailsand called out thehoursby the water-clock.
Watches & clocks
- 24-hour clock
- against the clockidiom
- alarm
- alarm clock
- at/on the stroke ofsomethingidiom
- atomic clock
- clock
- horologist
- horology
- hour hand
- hourglass
- jewel
- military time
- movement
- stroke
- ticking
- timekeeper
- timepiece
- turn the clocks backphrase
- twenty-four-hour clock