τούτων γάρ ἑκάτερον κοινῷ ὀνόματι προσαγορεύεται ζῷον, καί ὁ λόγος δέ τῆς οὐσίας ὁ αὐτός → and these are univocally so named, inasmuch as not only the name, but also the definition, is the same in both cases (Aristotle, Categoriae 1a8-10)
hydraula: ae, or hydraules, ae, m., = ὑδραύλης,
I one who plays on the waterorgan, Suet. Ner. 54; Petr. 36; acc. -am, Mart. Cap. 9, § 924.