VACZ (Ger. Waitzen)  , a town of Hungary, in the county of Pest-Pilis-Solt-Kis-Kun, 20 M . N. of Budapest by rail . Pop . (rgoo) 16,563 . It is situated on the left bank of the Danube, at the point where this river takes its southern course, and at the foot of the Nagyszal (Ger . Waitzenberg), on the outskirts of the Carpathians . It is the seat of a Roman Catholic bishopric, founded in the Ilth century, and contains a beautiful cathedral, built in 1761-1777, after the model of St Peter's at Rome . Amongst other buildings are the episcopal palace, with a museum of Roman and medieval antiquities, several convents, and the principal deaf and dumb institute in the country . There are large vineyards in the neighbouring hilly district, and the exportation of grapes is extensively carried on . Vacz was the scene of two victories gained by the Austrians against the Turks, one in 1597 and the other in 1684 . VADE-MECUM, a Latin phrase meaning literally " come with me " (Dade, imperative of vaderc, to go or come; cum, with; me, abl. of ego, I), and used in French, Spanish and English for something that a person is in the habit of constantly taking about with him, especially a book of the nature of a handy guide or work of reference .