broach

1. A series of chisel points mounted on one piece of steel. For example, the toothed stone chisel shown here.
2. A broad chisel for stone-cutting.
3. A spit for cooking food.
4. An awl; a bodkin; also, a wooden rod or pin, sharpened at each end, used by thatchers.
5. A spit-like start on the head of a young stag.
6. The stick from which candle wicks are suspended for dipping.
7. The pin in a lock which enters the barrel of the key.

Plural broaches