cham·fer
noun/ˈtʃæmfə(r)/
/ˈtʃæmfər/
(specialist)- a cut made along an edge or on a corner so that it slopes rather than being at 90°
斜切面；削角 Word Originmid 16th cent. (in the sense ‘flute or furrow’): back-formation from chamfering, from French chamfrain, from chant ‘edge’ (see the verb cant) + fraint ‘broken’ (from Old French fraindre ‘break’, from Latin frangere).