1. ribbed(a = adj.all) - furnished or strengthened with ribs;
Antonym: ribless
2. ribbed(s = adj.all) costate - (of the surface) having a rough, riblike texture;
1. Furnished or formed with ribs; as, a ribbed cylinder; ribbed cloth. [1913 Webster]
2. Intercalated with slate; -- said of a seam of coal. Raymond. [1913 Webster]
ribbed, adj. having ribs or riblike markings.
N furrow, groove, rut, sulcus, scratch, streak, striae, crack, score, incision, slit, chamfer, fluting, corduroy road, cradle hole, channel, gutter, trench, ditch, dike, dyke, moat, fosse, trough, kennel, ravine, tajo, thank-ye-ma'am, furrowed, ribbed, striated, sulcated, fluted, canaliculated, bisulcous, bisulcate, bisulcated, canaliferous, trisulcate, corduroy, unisulcate, costate, rimiform.