Lewis & Short

săbŭlo, ōnis, m. (săbŭlum, i, n., Varr. ap. Non. 169, 10; Plin. 17, 4, 3, § 25; 31, 3, 28, § 48; 36, 25, 63, § 188; Curt. 7, 4, 27), coarse sand, gravel (syn.: harena, glarea), Varr. R. R. 1, 9, 5; Col. 3, 11, 9; 4, 33, 1; Vitr. 2, 3; 8, 1; Pall. Aug. 8, 2.
Sync.: sā̆blo and sā̆blum, Ven. Fort. 9, 15, 5.