Lewis & Short

cantăbrum, i, n. [etym. unknown; the connection with Cantabria is a mere conjecture].

  1. I. A kind of bran (late Lat.), Cael. Aur. Tard. 3, 2; 4, 3; Apic. 7, 1; Schol. Juv. 5, 11 (as an explanation of far caninum); hence, cantabricus sucus, Veg. 5, 56, 3.
  2. II. A kind of banner or standard under the emperors, Min. Fel. Oct. 29; Tert. Apol. 16.