Byrst

According to the Old English Dictionary:

es;

byrst

n. A bristle; seta :-- Byrst seta, Wrt. Voc. 286, 57: Glos. Epnl. Recd. 162, 49. Hyre twigu beóþ swylce swínene [MS. swinen] byrst its twigs are like swine bristles, Herb. 52, 2; Lchdm. i. 156, 3. [Frs. boarstel, m. f: Dut. borstel, m: Ger. borste, f: O. H. Ger. burst, n; bursti, pursta, f: Dan. bórste, m. f: Swed, borst, m: Icel. burst, f.] byrst