A region of the stratosphere over Antarctica (and a smaller one over the Arctic) that is depleted of ozone in the local spring.

(Australia) A type of undersea hole or spring on the Great Barrier Reef in Australia, out of which comes fresh water that has flowed underground from the land.

A hole drilled into a surface so that, when a screw is inserted, the screw head is level with the surface.

A hole through an object which is large enough to enable threads of a screw or bolt to pass through but not the head of the screw or bolt.

A narrow hole drilled or punched into a surface, to facilitate the insertion of a wider screw, nail, drill bit, or other boring tool.

An isolated or secluded place; a hideaway or hideout.

A warning of an imminent explosion in a confined space, especially a grenade or blasting charge. / (slang) A generalized warning that something is about to happen.

A round hole in an anvil designed to hold a pritchel or other round-shanked blacksmithing tool.

A square, tapered hole in an anvil used to hold certain blacksmithing tools

plural of hardy hole