Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† 1. pyrgus, i, m., = πύργος, a little wooden tower on the side of a gaming-board, hollow and having steps inside, through which the dice were thrown upon the board (pure Lat. turricula), Sid. Ep. 8, 12 (in Hor. S. 2, 7, 17, called phimus; v. phimus).
2. Pyrgus, i, m., = Πύργος, a castle in Elis, Liv. 27, 32; Rutil. Itin. 223.