Lewis & Short

cartĭlāgo, ĭnis, f. [Sanscr. kart, to spin; cf. κάρταλος, cratis],

  1. I. cartilage, gristle; in animals, Cels. 8, 1; Plin. 11, 37, 87, § 216; 9, 24, 40, § 78; 11, 4, 3, § 9.
  2. II. Transf., in plants, a substance harder than pulp but softer than woody fibre, Plin. 15, 28, 34, § 116; 16, 36, 64, § 158.