FLINT Copy link • FLINTsilex: lapis silex: lapis siliceus; saxum silex; saxum siliceum: of or made of a flint, siliceus. FIG., His heart is as hard as a flint, habet silices pectus ejus (Ov., Trist., 3, 11, 4); stat ei in corde silex (Tib., 1, 1, 64).