Lewis & Short

Cȳzĭcum, i, n. (access. form analog. to the Gr. Cȳzĭcus, i, f., Prop. 3 or 4, 22, 1; and Cȳzĭcŏs, Ov. Tr. 1, 10, 29; Auct. Priap. 76, 13), = Κύζικος,

  1. I. a town celebrated in ancient times, in Mysia, on an island or peninsula of the same name in the Propontis, now Chizico, Atraki, or Balkiz, Mel. 1, 19, 2; Plin. 5, 32, 40, § 142; Flor. 3, 5, 15; Sall. H. 3, 16 sqq.; and 4, 61, 14 Dietsch.
    Hence,
  2. II. Cȳzĭcēnus, a, um (cf. upon the formation of the word Varr. L. L. 8, § 81 Müll.), adj., of or belonging to Cyzicum: triclinia, Vitr. 6, 10: ostrea, Plin. 32, 6, 21, § 62: marmor, id. 5, 32, 44, § 151.
    In plur.: Cȳzĭ-cēni, ōrum, m., the inhabitants of Cyzicum. Cic. Imp. Pomp. 8, 20; Tac. A. 4, 36 al.