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==Wikipedia EN==
A [[water clock]] or [[clepsydra]] (Greek [[κλεψύδρα]] from [[κλέπτειν]] kleptein, 'to [[steal]]'; [[ὕδωρ]] hydor, '[[water]]') is any timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount is then measured.

Water clocks are one of the oldest time-measuring instruments. The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon, Egypt, and Persia around the 16th century BC. Other regions of the world, including India and China, also have early evidence of water clocks, but the earliest dates are less certain. Some authors, however, claim that water clocks appeared in China as early as 4000 BC. Water clocks were also used in ancient Greece and ancient Rome, described by technical writers such as Ctesibius and Vitruvius.
==Translations==
ar: ساعة مائية; arz: كليبسيدرا; az: su saatı; bg: воден часовник; bn: জলঘড়ি; ca: rellotge d'aigua; cs: vodní hodiny; da: vandur; de: [[Wasseruhr]]; en: water clock; eo: akvohorloĝo; es: [[reloj de agua]]; eu: ur erloju; fa: ساعت آبی; fi: vesikello; fr: horloge hydraulique; gd: uaireadair-uisge; gl: reloxo de auga; he: שעון מים; hi: जल घड़ी; hr: vodeni sat; hu: vízóra; hy: ջրի ժամացույց; id: jam air; it: orologio idraulico; ja: 水時計; ko: 물시계; lt: vandens laikrodis; ms: jam air; ne: जल घडी; nl: [[wateruurwerk]], [[waterklok]]; no: vannklokke; oc: relòtge d'aiga; pl: zegar wodny; ru: [[водяные часы]]; sh: vodeni sat; simple: water clock; sl: vodna ura; sr: водени часовник; sv: vattenur; ta: நீர்க்கடிகாரம்; te: నీటి గడియారం; th: นาฬิกาน้ำ; tr: su saati; uk: водяний годинник; vi: đồng hồ nước; zh_yue: 銅壺滴漏; zh: 水鐘