Lewis & Short

Cŏlossae, ārum, f., = Κολοσσαί, a city of Phrygia on the Lycus, now Khonas; to the church in this place Paul’s Epistle to the Colossians was addressed, Plin. 5, 32, 41, § 145; Vulg. Col. 1, 2.
Hence,

  1. A. Cŏlos-senses, ium, m., the Colossians, the inhabitants of Colossœ, Ambros. Spir. Sanct. 2, 20.
  2. B. Cŏlossīnus, a, um, adj., = Κολοσσῖνος, of or belonging to Colossœ: flos, Plin. 21, 9, 27, § 51.