hydraulus

noun hy·drau·lus \hīˈdrȯləs\

Definition of hydraulus

plural

hydrauli

or

hydrauluses

  1. :  an ancient Roman pipe organ using water pressure as a means of compressing the air

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of hydraulus

Latin, from Greek hydraulos hydraulic organ, from hydr- + aulos reed instrument like an oboe — more at alveolus


Seen and Heard

What made you want to look up hydraulus? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

capable of being understood in two ways

Get Word of the Day daily email!