Also 7 bourt, 9 boart. [Possibly a. OF. bord, bort, bastard; the word is used in mod.F. (Littré, supplement) as bord and bort, but is not in Cotgr., 1611.] The fragments removed from diamonds in cutting, when too small for jewellery; also diamonds of too coarse a quality for jewellery: used to make diamond powder.
1622. Malynes, Anc. Law-Merch., 74. The Flat Diamonds, which are in the superficies of the Bourt of Diamonds, and are impure, commonly beaten therefore into powder for the vse of the other Diamonds, that are cut and polished by the Millne.
1817. Jas. Mill, Brit. India, I. II. viii. 353. In a flat press, where under steel wheels, the diamonds are fastened, and with its own bort are worn into what cut the artist pleases.
1884. F. Britten, Watch & Clockm., 129. Drills are selected from needle-shaped pieces of bort.
