Lewis & Short

lātĭclāvĭus, a, um, adj. [1. latus-clavus, II. 4.], having a broad purple stripe, broad-striped.

  1. I. Adj.: mappa, Petr. 32: tunica (a mark of distinction borne by senators, military tribunes of the equestrian order, and the sons of distinguished families who were fitting themselves for offices of state; cf. clavus), Val. Max. 5, 1, n. 7: tribunus, Suet. Dom. 10; Inscr. Orell. 133.
  2. II. Subst.
    1. A. lātĭclāvĭus, ii, m., one entitled to wear the latus clavus, a senator, patrician: a quodam laticlavio prope ad necem caesus, Suet. Ner. 26; id. Aug. 38.
    2. B. lātĭclāvĭum, ii, n., for laticlavus, a broad purple stripe on the tunic, worn as a mark of distinction (v. supra): laticlavium πλατύσημον, Gloss. Philox.; Dig. 24, 1, 42: per laticlavii honorem, Lampr. Commod. 4.