Lewis & Short

Euphrātes (in Inscr. also EVFRATES), is, m., = Εὐφράτης, [??]

  1. I. A wellknown river in Syria, which rises in Armenia, and, after its junction with the Tigris, empties into the Persian Gulf, now Frat, Mel. 1, 11, 2; 3, 8, 5; Plin. 5, 24, 20, § 83 sqq.; Prud. Ham. 562; Cic. N. D. 2, 52, 130; Plin. Pan. 14; abl. Euphratē, Luc. 8, 358.
      1. 2. Meton., the dwellers on its banks, Verg. G. 1, 509.
        Hence,
    1. A. Euphrā-taeus, a, um, = Εὐφραταῖος, of the Euphrates, i. e. Armenian: diademata, Stat. S. 2, 2, 122.
    2. B. Euphrātis, ĭdis, f., adj., of the Euphrates: ripa, Sid. Ep. 8, 9.
  2. II. A philosopher in the time of the younger Pliny, Plin. Ep. 1, 10.—‡
  3. III. A rare Roman surname: M. IVNIVS EVFRATES, Inscr. in Bull. dell. Inst. 1844, p. 90.