noun The hole in a lock where the key is inserted and turns.
noun Any small opening resembling the hole for a key in shape or function; especially, one that gives a vista of, or access to, a space beyond. A small incision through which surgical instruments can reach into an anatomic space beyond.
noun A small incision through which surgical instruments can reach into an anatomic space beyond.
noun A circle cut out of a garment as a decorative effect, typically at the front or back neckline of a dress.
noun A hole or excavation in beams intended to be joined together, to receive the key that fastens them.
noun A mortise for a key or cotter.
noun A transient column of vapor or plasma formed when using high energy beams, such as lasers, for welding or cutting.
laser keyhole welding
noun A welding method in which a hole forms in the surface immediately ahead of the puddle in the direction of welding. The hole is filled as the weld progresses.