Lewis & Short

sĭlīgĭnĕus (late form sĭlīgnus, Dynam. 1, 7), adj. [siligo], of wheat, wheaten: farina, Cato, R. R. 121; Plin. 18, 9, 20, § 88: panis, Varr. ap. Non. 88, 14; Sen. Ep. 123, 2; Vop. Aurel. 35: cunni, i. e. wheaten loaves of obscene form, Mart. 9, 3, 3; cf. Priapus, id. 14, 69 in lemm.