Lewis & Short

Rhīzinĭum, ii, n., a town of Dalmatia, upon the Gulf of Cattaro, Plin. 3, 22, 26, § 144; called also Rhīzon, ōnis, now Risano, Liv. 45, 26.
Hence, Rhīzōnītae, ārum, m., the inhabitants of this town, Liv. 45, 26, 15.