Lewis & Short

Phĕnĕos or -us, i, f., = Φένεος,

  1. I. a town of Arcadia, with a lake of the same name, the fabled Stygian waters, Ov. M. 15, 332; Liv. 28, 7; Verg. A. 8, 165.
    The city is called Phĕnĕum in Plin. 4, 6, 10, § 20.
    Hence,
  2. II. Phĕnĕātae, ārum, m., = Φενεάται, the inhabitants of Pheneüs, the Pheneans, Cic. N. D. 3, 22, 56; Lact. 1, 6, 3.