A passage of restricted width between two caves or hollows in the karst underground; often not readily traversable [20]. Synonyms: (French.) etroiture; (German.) Enge; (Greek.) steno perasma; (Italian.) strettoia; (Russian.) laz; (Spanish.) laminador, gatera; (Turkish.) agiz gecit; (Yugoslavian.) sutjeska, klisura, soteska.