Lewis & Short

quā̆drātārĭus, a, um, adj. [quadratus], of or belonging to work with the square, i. e. to the work of the stone-cutter: OPVS, perh. a stone monument, Inscr. Murat. 2012, 2.
As subst.: quā̆drātārĭus, ĭi, m., a stonecutter (post-class.), interchanged with lapidicida, Sid. Ep. 3, 12; Cod. Just. 10, 64, 1; Auct. Limit. p. 294 Goes.