Meanings of french burr in English

These old French burrs be the best stone; they be hard, but they be mild and takes the peck well.'

Now, the French burr was not only hard but mild, and seemed to feel the corn as it crushed it.

There's enough in the millpond to drive the mill wheel that drives the French burr mill stones for about 40 minutes.

The French burrs which Tibbald preferred come over in fragments, and these are carefully fitted together and stuck with plaster of Paris.

A variety of rock resembling the French burr occurs in abundance on Butcher's-fork of Powell's river, about twenty miles northwardly of the Natural Tunnel.