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hydraulus

[hahy-draw-luh s] /haɪˈdrɔ ləs/
noun, plural hydrauli
[hahy-draw-lahy] /haɪˈdrɔ laɪ/ (Show IPA),
hydrauluses.
1.
a pipe organ of ancient Greece and Rome using water pressure to maintain the air supply.
Origin of hydraulus
1870-1875
1870-75; < Latin < Greek hýdraulos water organ, equivalent to hydr- hydr-1 + aulós pipe
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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