The topmost edge along a mountain ridge.

Any of three breeds of dog with a distinctive ridge of hair that runs against the grain of the rest of the coat along the spine: the Rhodesian Ridgeback, the Phu Quoc Ridgeback and the Thai Ridgeback.

The practice of scouring the countryside, normally on foot, in areas with cave potential. The objective is to locate new and previously undiscovered openings to the underground.

plural of ridgeback