Obs. rare–1. [ad. F. engrener, f. en- (see EN- pref.1) + grain lit. ‘grain.’]

1

  intr. Of a toothed wheel, etc.: To fit into a corresponding toothed piece of machinery.

2

a. 1774.  Goldsmith, Exper. Philos. (1776), II. 52. By means of the toothed wheel F engraining in the toothed rack Dd.

3