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[hahy-draw-luh s]
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noun, plural hy·drau·li [hahy-draw-lahy] /haɪˈdrɔ laɪ/, hy·drau·lus·es.
  1. a pipe organ of ancient Greece and Rome using water pressure to maintain the air supply.

Origin of hydraulus

1870–75; < Latin < Greek hýdraulos water organ, equivalent to hydr- hydr-1 + aulós pipe

Examples from the Web for hydraulus

Historical Examples

  • (mosaics), where the buccinator is accompanied on the hydraulus.

    Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3