pin

A short, straight, stiff piece of wire with a blunt head and a sharp point, used especially for fastening.

Something, such as a safety pin, that resembles such a piece of wire in shape or use.

A whit; a jot.

A slender, usually cylindrical piece of wood or metal for holding or fastening parts together, or serving as a support for suspending one thing from another, as.

A thin rod for securing the ends of fractured bones.

A peg for fixing the crown to the root of a tooth.

A cotter pin.

The part of a key stem entering a lock.

One of the pegs securing the strings and regulating their tension on a stringed instrument.