1. metallic noise; sound made by cars; guttural pronunciation of r; rough edge; prickly seed pod. burbur, burr burr ] , n. [oe. burre burdock; cf. dan. borre, osw. borra, burdock, thistle; perh. akin to e. bristle (burr- for burz-), or perh. to f. bourre hair, wool, stuff; also, according to cotgrave, the downe, or hairie coat, wherewith divers herbes, fruits, and flowers, are covered, fr. l. burrae trifles, ll. reburrus rough.]