(n.) A longitudinal opening in a body, made by cutting; a cleft; a fissure.

abysm abyss arroyo box canyon breach break canyon cavity chap chasm check chimney chink cleft cleuch clough col coulee couloir crack cranny crevasse crevice cut cwm 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 seam slit slot split trench valley void wadi