Lewis & Short

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Marcellus, i, m. [dim. of Marcus],

  1. I. a Roman family name in the plebeian gens Claudia: inter Marcellos et Claudios patricios, Cic. de Or. 1, 39, 176: generosior Marcellis, Juv. 2, 145.
    1. B. Esp., M. Claudius Marcellus, the taker of Syracuse, Liv. 25, 23 fin.; Cic. Off. 1, 18, 61; id. Rep. 1, 1, 1; 1, 14, 21; Verg. A. 6, 855; Hor. C. 1, 12, 46.
      Another M. Claudius Marcellus, the nephew of Octavian and adopted by him, Vell. 2, 93; Tac. A. 1, 3; Prop. 3, 18 (cf. Verg. A. 6, 861 sq.); Hor. C. 1, 12, 46; Sen. ad Marc. 2, 3.
  2. II. Derivv.
    1. A. Marcellīa (ēa), ōrum, n., a festival in honor of the Marcelli in Syracuse, Cic. Verr. 2, 2, 21, § 51; 2, 2, 63, § 154.
    2. B. Marcellĭānus, a, um, adj., of or belonging to a Marcellus, Marcellian: theatrum, named after M. Claudius Marcellus, the nephew of Augustus, Suet. Vesp. 19; id. Aug. 29.