• (n.) A halfround single-cut file or fioat, having one curved face and one straight face, -- used by comb makers.
Graille (gr&mac;l) noun [ Confer French grêle a sort of file.] A halfround single-cut file or fioat, having one curved face and one straight face, -- used by comb makers. Knight. 
A graille is a single-cut file having one curved and one straight face, formerly used by comb makers.