Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Itius (Iccius) Portus, a port of the Morini, in Belgic Gaul, from which Cæsar passed over to Britain, now Wissant or Witsand, a few miles east of Cape Grisnez, Caes. B. G. 5, 2, 2; 5, 5, 1.