Lewis & Short

1. Phāsis, ĭdis or ĭdos (acc. also Phasin, Prop. 3, 22, 11; Sen. Cons. Helv. 10, 3: Phasim, Verg. G. 4, 367 al.; voc. Phasĭ, Ov. P. 4, 10, 52), m., = Φᾶσις.

  1. A. A river in Colchis, which empties into the Euxine Sea, now Rion, Mel. 1, 19, 12; Plin. 6, 4, 4, § 12: limosi Phasidos undae, Ov. M. 7, 6: sua jura cruentum Phasin habent, Stat. Th. 5, 457: Phasidis ales, a pheasant (v. in the foll. Phasiacus), id. S. 4, 6, 8; cf.: ultra Phasin capi volunt, quod ambitiosam popinam instruat, Sen. Cons. Helv. 10, 3.
  2. B. Transf., a town and its harbor lying at the mouth of the Phasis, a colony of the Milesians, now Poti, Mel. 1, 19, 12; Plin. 6, 4, 4, § 13.
    Hence,
  1. A. Phāsis, ĭdis, adj. f., Phasian; poet. Colchian: volucres, i. e. pheasants, Mart. 13, 45, 1.
    Subst.: Phāsis, ĭdis, f., the Colchian, a term applied to Medea; acc. Phasida, Ov. F. 2, 42.
  2. B. Phā-sĭăcus, a, um, adj., = Φασιακός, of or belonging to the Phasis, Phasian; also poet. Colchian: angulus, Mel. 2, 2, 5: unda, Ov. Tr. 2, 439: terra, id. R. Am. 261: corona, which Medea presented to Creusa, id. Ib. 605: ales Phasiacis petita Colchis, i. e. the pheasant, Petr. 93.
  3. C. Phāsĭānus, a, um, adj., = Φασιανός, of or belonging to the Phasis, Phasian: Phasianae aves, pheasants, Plin. 10, 48, 67, § 132.
    As subst.: phāsĭāna, ae, f., a pheasant, Plin. 11, 33, 39, § 114.
    More freq., phāsĭānus (fāsĭān-), i, m., Suet. Vit. 13; Pall. 1, 29; Lampr. Alex. Sev. 41 fin.; Edict. Diocl. p. 14.
    According to the myth, it is the metamorphosed Itys, daughter of Tereus; v. Itys.
  4. D. Phā-sĭas, ădis, adj. f., = Φασιάς, of or belonging to the Phasis, Phasian; poet. Colchian: Phasias Aeetine, Ov. H. 6, 103: puella, i. e. Medea, id. P. 3, 3, 80.
    Subst.: Phāsĭas. ădis, f., Medea, Ov. A. A. 2, 382.