Lewis & Short

Amphrȳsus or -ŏs, i, m., = Ἀμφρυσός,

  1. I. a small river in the Thessalian province of Phthiotis, near which Apollo fed the flocks of Admetus, Ov. M. 1, 580; 7, 229; Verg. G. 3, 2.
  2. II. Derivv.
    1. A. Am-phrȳsĭus, a, um, adj., belonging to Amphrysus, or, poet. transf., to Apollo: vates, i. e. the Sibyl, Verg. A. 6, 398.
    2. B. Am-phrȳsĭăcus, a, um, adj., the same: gramen, Stat. S. 1, 4, 105.