Lewis & Short

Păraetŏnĭum, ii, n., = Παραιτόνιον,

  1. I. a seaport town in Northern Africa, between Egypt and the Syrtes, now Marsa Labeit, Plin. 5, 5, 5, § 33; Ov. Am. 2, 13, 7; id. M. 9, 772.
    Hence,
  2. II. Păraetŏnĭus, a, um, adj., Parœtonian: portus, Mela, 1, 8, 2.
    Subst.: păraetŏnĭum, ii, n., a certain white and pure chalk found near Parœtonium, Parœtonium-white, Plin. 35, 6, 18, § 36; 33, 5, 27, § 90; Vitr. 7, 7.
    1. B. Transf., Egyptian, African: Paraetonius Nilus, Stat. Th. 5, 12: urbs, i. e. Alexandria, Luc. 10, 9: litus, Egyptian, Claud. B. Gild. 160: serpens, African, Sil. 17, 450.