keyhole

Definitions

• The hole in a lock where the key is inserted and turns.
• Any small opening resembling the hole for a key in shape or function.
• A circle cut out of a garment as a decorative effect, typically at the front or back neckline of a dress.
• (carpentry) A hole or excavation in beams intended to be joined together, to receive the key that fastens them.
• (engineering) A mortise for a key or cotter.
• (lasers) A transient column of vapor or plasma formed when using high energy beams, such as lasers, for welding or cutting.
• (metallurgy) 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.
• (basketball) The free-throw lane together with the circle surrounding the free-throw line; key.
• (astronomy) A gravitational keyhole.