Lewis & Short

būcĭnum (bucc-), i, n. [bucina].

  1. I. The sound or blast of a trumpet, Plin. 9, 33, 52, § 103; 11, 10, 10, § 20.
    Hence, ad Bucinum, a quarter in Rome, Dig. 14, 4, 5, § 16.
  2. II. A shell-fish used in dyeing purple, Plin. 9, 36, 61, § 129 sq.