society > occupation and work > equipment > machine tool > [noun] > vibration of > marks caused by (3)
plural. Indentations or marks made on a surface by the vibration or too great pressure of a tool.
(a) Geology a mark made on a surface by a fragment of rock on the under-surface of glacier ice; (b) (see quot. 1893).
The vibration of a tool (see also quot. 1904). Cf. chatter, v. 4.