Lewis & Short

1. cornĭcŭlum, i, n. dim. [cornu], a little horn.

  1. I. Prop., Plin. 9, 42, 67, § 143; 11, 28, 34, § 100.
  2. II. Meton.
    1. A. A small tunnel of horn, Col. 7, 5, 15 and 20.
    2. B. A horn-shaped ornament upon the helmet, as a reward for bravery, Liv. 10, 44, 5; Aur. Vict. 723; Suet. Gram. 9; cf. Plin. 10, 43, 60, § 124.