Dictionaryhy•drau•lusPronunciation: (hī-drô'lus), [key] —n., —pl. -liPronunciation: (-lī), [key] -lus•es. a pipe organ of ancient Greece and Rome using water pressure to maintain the air supply. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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