Chat·ter mark. (a) Mach. One of the fine undulations or ripples which are formed on the surface of work by a cutting tool which chatters. (b) Geol. A short crack on a rock surface planed smooth by a glacier.
◄ ►
chatter mark
n 1: marks on a glaciated rock caused by the movement of a
glacier
2: a mark made by a chattering tool on the surface of a
workpiece