sēmĭ-circŭlus, a, um, adj.,
semicircular : ager, Col. 5, 2, 8.—Hence, subst.: sēmĭ-circŭlus , i, m., a half-circle , semicircle (syn. semiorbis): uncus in semicirculi speciem, Cels. 7, 26, 2: ager, i. e. semicircular , Col. 5, 2, 8.