burr

1. A sharp, pointy object, such as a sliver or splinter.
2. A small piece of material left on an edge after a cutting operation. · You left a bunch of burrs on those parts yesterday. You've already been told not to miss the deburring operation.
3. A thin flat piece of metal, formed from a sheet by punching; a small washer put on the end of a rivet before it is swaged down.
4. A broad iron ring on a tilting lance just below the grip, to prevent the hand from slipping.
5. A metal ring at the top of the hand-rest on a spear.
6. The ear lobe.
7. A burr knot or burl.
8. The knot at the bottom of an antler.

Plural burrs