Lewis & Short

sublĭca, ae, f., a stake or pile driven into the ground, a palisade (cf.: palus, sudes, stipes), Caes. B. C. 3, 49; Liv. 23, 37; Vitr. 3, 3.
Esp., of the piles for a bridge, Caes. B. G. 4, 17; 7, 35; Liv. 1, 37.
In the form sublices, Sall. H. Fragm. 4, 77; cf. Gloss. Labb.