Būsk1, n.
n. [Fr. busc, busque, from the hypothetical older form of Fr. bois, bos, wood, because the first busks were made of wood. See Bush, and cf. O. Fr. busche, N. Fr. bûche, a piece or log of wood, from the same root.] A long, thin piece of metal, whale-bone, or wood, somewhat elastic, and worn in the front of women’s corsets; a corset-board.
Her long slit sleeves, stiff busk, puff verdingall, Is all that makes her thus angelical. Marston.