Lewis & Short

1. mĕrŭla, ae, f. (post-class. collat. form mĕrŭlus, i, m., Auct. Carm. Philom. 13), a blackbird, ousel, merle.

  1. I. Lit.: evolare merulas, Cic. Fin. 5, 15, 42: ut merula, quia sola volat, quasi mera volans nominaretur, Quint. 1, 6, 38; cf. Plin. 10, 29, 42, § 80; 10, 30, 45, § 87; 10, 53, 74, § 147.
  2. II. Transf.
    1. A. A fish, the sea-carp: merulae virentes, Ov. Hal. 114; cf. Plin. 32, 11, 53, § 149.
    2. B. A kind of hydraulic machine that produced a sound like the note of the blackbird, Vitr. 10, 12.