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What is the English name of this instrument, that measures the consumption of water?

In Hebrew we call it "Sheon Mayim" (literally: "water clock"), but in English, water clock is a clock for measuring time, based on the flow of water.

Another Hebrew name is "Mad Mayim" (literally: "water measurer"), but in English water measurer is an insect.

Google Translate says "Hydrometer", but a Hydrometer is an instrument for measuring some properties of water.

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    That's a water meter. en.wikipedia.org/wiki/Water_metering There's a different group that may be better for questions like this: ell.stackexchange.com – dcaswell Sep 7 '13 at 22:27
  • Thanks, I tried everything but this :) – Erel Segal-Halevi Sep 7 '13 at 22:29
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    A klepsydra or clepsydra, from Gk κλέπτειν 'to steal' + ὕδωρ 'water' > 'water thief'. Klept- as in kleptomania, and hydr- as in hydroelectric (in Greek /h/ sometimes alternated with /s/). – John Lawler Sep 8 '13 at 2:38
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    @JohnLawler, the s in clepsydra is not from the ‘water’ part of the word: it’s from the aorist stem of κλέπτω, which is of course κλεψ-. The initial /h/ is simply suppressed here (as always in compounds, since aspiration can only occur lexeme-initially). There is no s-initial variant of the word ὕδωρ: its initial aspiration is purely automatic and unetymological. (Thankfully—‘swater’ wouldn’t be a very nice word for it, and we’d have to be drinking svodka and swisk(e)y …) – Janus Bahs Jacquet Sep 8 '13 at 11:51
  • Thanks, I wasn't sure about the verb forms of κλέπτειν. s/h alternations are common enough, but this looked odd. – John Lawler Sep 8 '13 at 15:53
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That is a water meter.

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In a lot of part of America you will see a bigger sized "green" meter that is checked every so often by the water company so they can send bills. This is a typical older style or one found in larger multi-unit buildings.

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