Lewis & Short

burra, ae, f. [burrus].

  1. I. A small cow with a red mouth or muzzle, acc. to Fest. s. v.
  2. II. A shaggy garment, Anthol. Lat. 5, 133, 5.
    Hence, plur.: burrae, ārum, f., trifles, nonsense (post-class.): burras, quisquilias, ineptiasque, etc., Aus. praef. ad Latin. Pacat. 3.