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“hydraulic” in Latin

The English word hydraulic itself goes back to Latin hydraulĭcus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

hydraulic
hydraulicus (as technical term, though the word PROP. relates to water-organs): aquarius (relating to water; e.g., rota, vas). Hydraulic machines, machinae hydraulicae (as technical term) or *machinae aquariae.

Quick answer

What is the Latin word for hydraulic?
The usual Latin words for “hydraulic” are hydraulĭcus, aquārius. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.