1. (n.) That unwatered portion of a valley which forms its continuation beyond and above the most elevated spring that issues into it.
2. (n.) See Comb.
Thesaurus Entries
abysm, abyss, arroyo, box canyon, breach, break, canyon, cavity, chap, chasm, check, chimney, chink, cirque, cleft, cleuch, clough, col, combe, corrie, coulee, couloir, crack, cranny, crevasse, crevice, cut, defile, dell, dike, ditch, donga, draw, excavation, fault, fissure, flaw, flume, fracture, furrow, gap, gape, gash, gorge, groove, gulch, gulf, gully, hole, incision, joint, kloof, leak, moat, notch, nullah, opening, pass, passage, ravine, rent, rift, rime, rupture, scissure, seam, slit, slot, split, trench, valley, void, wadi
